1187940 has 48 divisors (see below), whose sum is σ = 3584448. Its totient is φ = 292224.

The previous prime is 1187939. The next prime is 1187941. The reversal of 1187940 is 497811.

It is an interprime number because it is at equal distance from previous prime (1187939) and next prime (1187941).

It is a super-2 number, since 2×1187940² = 2822402887200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a plaindrome in base 14.

It is a zygodrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 1187898 and 1187907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1187941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19 + ... + 1541.

It is an arithmetic number, because the mean of its divisors is an integer number (74676).

2^1187940 is an apocalyptic number.

1187940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1187940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1792224).

1187940 is an abundant number, since it is smaller than the sum of its proper divisors (2396508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1187940 is a wasteful number, since it uses less digits than its factorization.

1187940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1548 (or 1546 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 1187940 is about 1089.9266030334. The cubic root of 1187940 is about 105.9086670256.

The spelling of 1187940 in words is "one million, one hundred eighty-seven thousand, nine hundred forty".