1897611964 has 24 divisors (see below), whose sum is σ = 3484379808. Its totient is φ = 902531520.

The previous prime is 1897611943. The next prime is 1897611977. The reversal of 1897611964 is 4691167981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40327 + ... + 73630.

It is an arithmetic number, because the mean of its divisors is an integer number (145182492).

Almost surely, 2^1897611964 is an apocalyptic number.

It is an amenable number.

1897611964 is a deficient number, since it is larger than the sum of its proper divisors (1586767844).

1897611964 is a wasteful number, since it uses less digits than its factorization.

1897611964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114165 (or 114163 counting only the distinct ones).

The product of its digits is 653184, while the sum is 52.

The square root of 1897611964 is about 43561.5881712318. The cubic root of 1897611964 is about 1238.0432118320.

The spelling of 1897611964 in words is "one billion, eight hundred ninety-seven million, six hundred eleven thousand, nine hundred sixty-four".