1951840 has 48 divisors (see below), whose sum is σ = 5034960. Its totient is φ = 709120.

The previous prime is 1951837. The next prime is 1951843. The reversal of 1951840 is 481591.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1951837) and next prime (1951843).

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1951799 and 1951808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1951843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1206 + ... + 2314.

It is an arithmetic number, because the mean of its divisors is an integer number (104895).

2^1951840 is an apocalyptic number.

1951840 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 1951840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2517480).

1951840 is an abundant number, since it is smaller than the sum of its proper divisors (3083120).

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

1951840 is a wasteful number, since it uses less digits than its factorization.

1951840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135 (or 1127 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 1951840 is about 1397.0826747190. The cubic root of 1951840 is about 124.9725806525.

The spelling of 1951840 in words is "one million, nine hundred fifty-one thousand, eight hundred forty".