400609597 has 4 divisors (see below), whose sum is σ = 400776156. Its totient is φ = 400443040.

The previous prime is 400609591. The next prime is 400609613. The reversal of 400609597 is 795906004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 157904356 + 242705241 = 12566^2 + 15579^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400609597 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 (400609591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79618 + ... + 84499.

It is an arithmetic number, because the mean of its divisors is an integer number (100194039).

Almost surely, 2^400609597 is an apocalyptic number.

It is an amenable number.

400609597 is a deficient number, since it is larger than the sum of its proper divisors (166559).

400609597 is a wasteful number, since it uses less digits than its factorization.

400609597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166558.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 400609597 is about 20015.2341230374. The cubic root of 400609597 is about 737.1804055058.

The spelling of 400609597 in words is "four hundred million, six hundred nine thousand, five hundred ninety-seven".