997974 has 16 divisors (see below), whose sum is σ = 2217840. Its totient is φ = 332640.

The previous prime is 997973. The next prime is 997991. The reversal of 997974 is 479799.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9187 + ... + 9294.

It is an arithmetic number, because the mean of its divisors is an integer number (138615).

2⁹⁹⁷⁹⁷⁴ is an apocalyptic number.

997974 is an abundant number, since it is smaller than the sum of its proper divisors (1219866).

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

997974 is a wasteful number, since it uses less digits than its factorization.

997974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18492 (or 18486 counting only the distinct ones).

The product of its digits is 142884, while the sum is 45.

The square root of 997974 is about 998.9864863951. The cubic root of 997974 is about 99.9324210078.

The spelling of 997974 in words is "nine hundred ninety-seven thousand, nine hundred seventy-four".