1156890 has 48 divisors (see below), whose sum is σ = 3233952. Its totient is φ = 264096.

The previous prime is 1156873. The next prime is 1156907. The reversal of 1156890 is 986511.

It is a happy number.

1156890 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.

It is an interprime number because it is at equal distance from previous prime (1156873) and next prime (1156907).

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1077 + ... + 1863.

It is an arithmetic number, because the mean of its divisors is an integer number (67374).

2^1156890 is an apocalyptic number.

1156890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1156890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1616976).

1156890 is an abundant number, since it is smaller than the sum of its proper divisors (2077062).

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

1156890 is a wasteful number, since it uses less digits than its factorization.

1156890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811 (or 804 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 1156890 is about 1075.5882111663. The cubic root of 1156890 is about 104.9777730730.

The spelling of 1156890 in words is "one million, one hundred fifty-six thousand, eight hundred ninety".