997690401 has 12 divisors (see below), whose sum is σ = 1441382800. Its totient is φ = 665000280.

The previous prime is 997690387. The next prime is 997690403. The reversal of 997690401 is 104096799.

997690401 is a `hidden beast` number, since 99 + 76 + 90 + 401 = 666.

It is not a de Polignac number, because 997690401 - 2¹¹ = 997688353 is a prime.

It is a super-2 number, since 2×997690401² = 1990772272495081602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997690403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82650 + ... + 93948.

Almost surely, 2^997690401 is an apocalyptic number.

It is an amenable number.

997690401 is a deficient number, since it is larger than the sum of its proper divisors (443692399).

997690401 is a wasteful number, since it uses less digits than its factorization.

997690401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21116 (or 21113 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 997690401 is about 31586.2375252261. The cubic root of 997690401 is about 999.2295402108.

The spelling of 997690401 in words is "nine hundred ninety-seven million, six hundred ninety thousand, four hundred one".