1891251932 has 12 divisors (see below), whose sum is σ = 3323540640. Its totient is φ = 941668896.

The previous prime is 1891251919. The next prime is 1891251979. The reversal of 1891251932 is 2391521981.

It is a self number, because there is not a number n which added to its sum of digits gives 1891251932.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 988193 + ... + 990104.

It is an arithmetic number, because the mean of its divisors is an integer number (276961720).

Almost surely, 2^1891251932 is an apocalyptic number.

It is an amenable number.

1891251932 is a deficient number, since it is larger than the sum of its proper divisors (1432288708).

1891251932 is a wasteful number, since it uses less digits than its factorization.

1891251932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1978540 (or 1978538 counting only the distinct ones).

The product of its digits is 38880, while the sum is 41.

The square root of 1891251932 is about 43488.5264408901. The cubic root of 1891251932 is about 1236.6585227541.

The spelling of 1891251932 in words is "one billion, eight hundred ninety-one million, two hundred fifty-one thousand, nine hundred thirty-two".