1977397465 has 16 divisors (see below), whose sum is σ = 2485992960. Its totient is φ = 1508031360.

The previous prime is 1977397453. The next prime is 1977397481. The reversal of 1977397465 is 5647937791.

It is a de Polignac number, because none of the positive numbers 2^k-1977397465 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84820 + ... + 105589.

It is an arithmetic number, because the mean of its divisors is an integer number (155374560).

Almost surely, 2^1977397465 is an apocalyptic number.

It is an amenable number.

1977397465 is a deficient number, since it is larger than the sum of its proper divisors (508595495).

1977397465 is a wasteful number, since it uses less digits than its factorization.

1977397465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190512.

The product of its digits is 10001880, while the sum is 58.

The square root of 1977397465 is about 44467.9374943340. The cubic root of 1977397465 is about 1255.1568223579.

The spelling of 1977397465 in words is "one billion, nine hundred seventy-seven million, three hundred ninety-seven thousand, four hundred sixty-five".