1997901888 has 56 divisors (see below), whose sum is σ = 5456651520. Its totient is φ = 644482560.

The previous prime is 1997901883. The next prime is 1997901929. The reversal of 1997901888 is 8881097991.

It is a super-2 number, since 2×1997901888² = 7983223908147929088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1997901883) 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, 161883 + ... + 173786.

Almost surely, 2^1997901888 is an apocalyptic number.

It is an amenable number.

1997901888 is an abundant number, since it is smaller than the sum of its proper divisors (3458749632).

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

1997901888 is a wasteful number, since it uses less digits than its factorization.

1997901888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335715 (or 335705 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 60.

The square root of 1997901888 is about 44697.8957893993. The cubic root of 1997901888 is about 1259.4803198298.

The spelling of 1997901888 in words is "one billion, nine hundred ninety-seven million, nine hundred one thousand, eight hundred eighty-eight".