1951323840 has 84 divisors (see below), whose sum is σ = 6711750864. Its totient is φ = 520352256.

The previous prime is 1951323833. The next prime is 1951323859. The reversal of 1951323840 is 483231591.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1951323795 and 1951323804.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 335892 + ... + 341651.

It is an arithmetic number, because the mean of its divisors is an integer number (79901796).

Almost surely, 2^1951323840 is an apocalyptic number.

1951323840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1951323840 is an abundant number, since it is smaller than the sum of its proper divisors (4760427024).

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

1951323840 is a wasteful number, since it uses less digits than its factorization.

1951323840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677566 (or 677553 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 1951323840 is about 44173.7913247210. The cubic root of 1951323840 is about 1249.6156343559.

The spelling of 1951323840 in words is "one billion, nine hundred fifty-one million, three hundred twenty-three thousand, eight hundred forty".