1897872372 has 36 divisors (see below), whose sum is σ = 5233527936. Its totient is φ = 575112720.

The previous prime is 1897872331. The next prime is 1897872373. The reversal of 1897872372 is 2732787981.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1897872373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2395908 + ... + 2396699.

It is an arithmetic number, because the mean of its divisors is an integer number (145375776).

Almost surely, 2^1897872372 is an apocalyptic number.

1897872372 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1897872372 is an abundant number, since it is smaller than the sum of its proper divisors (3335655564).

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

1897872372 is a wasteful number, since it uses less digits than its factorization.

1897872372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4792628 (or 4792623 counting only the distinct ones).

The product of its digits is 2370816, while the sum is 54.

The square root of 1897872372 is about 43564.5770322633. The cubic root of 1897872372 is about 1238.0998411844.

The spelling of 1897872372 in words is "one billion, eight hundred ninety-seven million, eight hundred seventy-two thousand, three hundred seventy-two".