1900172872 has 16 divisors (see below), whose sum is σ = 3836887740. Its totient is φ = 877002816.

The previous prime is 1900172837. The next prime is 1900172891. The reversal of 1900172872 is 2782710091.

It can be written as a sum of positive squares in 2 ways, for example, as 1891728036 + 8444836 = 43494^2 + 2906^2 .

It is a super-2 number, since 2×1900172872² = 7221313886969456768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9135343 + ... + 9135550.

Almost surely, 2^1900172872 is an apocalyptic number.

It is an amenable number.

1900172872 is an abundant number, since it is smaller than the sum of its proper divisors (1936714868).

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

1900172872 is a wasteful number, since it uses less digits than its factorization.

1900172872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18270912 (or 18270908 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 1900172872 is about 43590.9723681406. The cubic root of 1900172872 is about 1238.5998921308.

The spelling of 1900172872 in words is "one billion, nine hundred million, one hundred seventy-two thousand, eight hundred seventy-two".