1997807877 has 48 divisors (see below), whose sum is σ = 3279640000. Its totient is φ = 1161734400.

The previous prime is 1997807849. The next prime is 1997807893. The reversal of 1997807877 is 7787087991.

It is a happy number.

It is not a de Polignac number, because 1997807877 - 2⁶ = 1997807813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997807837) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1108377 + ... + 1110177.

Almost surely, 2^1997807877 is an apocalyptic number.

It is an amenable number.

1997807877 is a deficient number, since it is larger than the sum of its proper divisors (1281832123).

1997807877 is a wasteful number, since it uses less digits than its factorization.

1997807877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2338 (or 2335 counting only the distinct ones).

The product of its (nonzero) digits is 12446784, while the sum is 63.

The square root of 1997807877 is about 44696.8441503424. The cubic root of 1997807877 is about 1259.4605646285.

The spelling of 1997807877 in words is "one billion, nine hundred ninety-seven million, eight hundred seven thousand, eight hundred seventy-seven".