997473840 has 80 divisors (see below), whose sum is σ = 3373284096. Its totient is φ = 241811200.

The previous prime is 997473839. The next prime is 997473853. The reversal of 997473840 is 48374799.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×997473840² = 1989908122968691200, which contains 22 as substring.

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, 186276 + ... + 191555.

Almost surely, 2^997473840 is an apocalyptic number.

It is an amenable number.

997473840 is an abundant number, since it is smaller than the sum of its proper divisors (2375810256).

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

997473840 is a wasteful number, since it uses less digits than its factorization.

997473840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377858 (or 377852 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 51.

The square root of 997473840 is about 31582.8092480704. The cubic root of 997473840 is about 999.1572366161.

The spelling of 997473840 in words is "nine hundred ninety-seven million, four hundred seventy-three thousand, eight hundred forty".