1897901636 has 24 divisors (see below), whose sum is σ = 3438906240. Its totient is φ = 915415200.

The previous prime is 1897901633. The next prime is 1897901653. The reversal of 1897901636 is 6361097981.

It is not an unprimeable number, because it can be changed into a prime (1897901633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136151 + ... + 149441.

It is an arithmetic number, because the mean of its divisors is an integer number (143287760).

Almost surely, 2^1897901636 is an apocalyptic number.

It is an amenable number.

1897901636 is a deficient number, since it is larger than the sum of its proper divisors (1541004604).

1897901636 is a wasteful number, since it uses less digits than its factorization.

1897901636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14555 (or 14553 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 1897901636 is about 43564.9129001769. The cubic root of 1897901636 is about 1238.1062047257.

The spelling of 1897901636 in words is "one billion, eight hundred ninety-seven million, nine hundred one thousand, six hundred thirty-six".