977690421 has 12 divisors (see below), whose sum is σ = 1421573920. Its totient is φ = 647476200.

The previous prime is 977690419. The next prime is 977690471. The reversal of 977690421 is 124096779.

It is not a de Polignac number, because 977690421 - 2¹ = 977690419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (977690401) 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 11 ways as a sum of consecutive naturals, for example, 358351 + ... + 361068.

Almost surely, 2^977690421 is an apocalyptic number.

It is an amenable number.

977690421 is a deficient number, since it is larger than the sum of its proper divisors (443883499).

977690421 is a wasteful number, since it uses less digits than its factorization.

977690421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719576 (or 719573 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 977690421 is about 31268.0415280522. The cubic root of 977690421 is about 992.5074759550.

The spelling of 977690421 in words is "nine hundred seventy-seven million, six hundred ninety thousand, four hundred twenty-one".