2157969804 has 12 divisors (see below), whose sum is σ = 5035262904. Its totient is φ = 719323264.

The previous prime is 2157969791. The next prime is 2157969887. The reversal of 2157969804 is 4089697512.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89915397 + ... + 89915420.

It is an arithmetic number, because the mean of its divisors is an integer number (419605242).

Almost surely, 2^2157969804 is an apocalyptic number.

It is an amenable number.

2157969804 is an abundant number, since it is smaller than the sum of its proper divisors (2877293100).

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

2157969804 is a wasteful number, since it uses less digits than its factorization.

2157969804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179830824 (or 179830822 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 51.

The square root of 2157969804 is about 46453.9535884730. The cubic root of 2157969804 is about 1292.2556940409.

The spelling of 2157969804 in words is "two billion, one hundred fifty-seven million, nine hundred sixty-nine thousand, eight hundred four".