1897430988 has 24 divisors (see below), whose sum is σ = 4431712320. Its totient is φ = 631852240.

The previous prime is 1897430987. The next prime is 1897430993. The reversal of 1897430988 is 8890347981.

It is a super-2 number, since 2×1897430988² = 7200488708445312288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1897430987) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 65358 + ... + 89813.

It is an arithmetic number, because the mean of its divisors is an integer number (184654680).

Almost surely, 2^1897430988 is an apocalyptic number.

It is an amenable number.

1897430988 is an abundant number, since it is smaller than the sum of its proper divisors (2534281332).

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

1897430988 is a wasteful number, since it uses less digits than its factorization.

1897430988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156197 (or 156195 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 57.

The square root of 1897430988 is about 43559.5108787966. The cubic root of 1897430988 is about 1238.0038530245.

The spelling of 1897430988 in words is "one billion, eight hundred ninety-seven million, four hundred thirty thousand, nine hundred eighty-eight".