997407 has 32 divisors (see below), whose sum is σ = 1632960. Its totient is φ = 599040.

The previous prime is 997391. The next prime is 997427. The reversal of 997407 is 704799.

It is not a de Polignac number, because 997407 - 2⁴ = 997391 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997427) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18793 + ... + 18845.

It is an arithmetic number, because the mean of its divisors is an integer number (51030).

2⁹⁹⁷⁴⁰⁷ is an apocalyptic number.

997407 is a deficient number, since it is larger than the sum of its proper divisors (635553).

997407 is a wasteful number, since it uses less digits than its factorization.

997407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 36.

The square root of 997407 is about 998.7026584525. The cubic root of 997407 is about 99.9134918516.

The spelling of 997407 in words is "nine hundred ninety-seven thousand, four hundred seven".