1997856942 has 16 divisors (see below), whose sum is σ = 4071105360. Its totient is φ = 653387072.

The previous prime is 1997856929. The next prime is 1997856947. The reversal of 1997856942 is 2496587991.

1997856942 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997856947) 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, 3140967 + ... + 3141602.

It is an arithmetic number, because the mean of its divisors is an integer number (254444085).

Almost surely, 2^1997856942 is an apocalyptic number.

1997856942 is an abundant number, since it is smaller than the sum of its proper divisors (2073248418).

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

1997856942 is a wasteful number, since it uses less digits than its factorization.

1997856942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6282627.

The product of its digits is 9797760, while the sum is 60.

The square root of 1997856942 is about 44697.3930112261. The cubic root of 1997856942 is about 1259.4708750839.

The spelling of 1997856942 in words is "one billion, nine hundred ninety-seven million, eight hundred fifty-six thousand, nine hundred forty-two".