1897166840 has 32 divisors (see below), whose sum is σ = 4290760080. Its totient is φ = 754931712.

The previous prime is 1897166839. The next prime is 1897166881. The reversal of 1897166840 is 486617981.

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 7 ways as a sum of consecutive naturals, for example, 115154 + ... + 130593.

Almost surely, 2^1897166840 is an apocalyptic number.

1897166840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1897166840 is an abundant number, since it is smaller than the sum of its proper divisors (2393593240).

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

1897166840 is a wasteful number, since it uses less digits than its factorization.

1897166840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245951 (or 245947 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 50.

The square root of 1897166840 is about 43556.4787373819. The cubic root of 1897166840 is about 1237.9464014106.

The spelling of 1897166840 in words is "one billion, eight hundred ninety-seven million, one hundred sixty-six thousand, eight hundred forty".