400207957 has 4 divisors (see below), whose sum is σ = 401955820. Its totient is φ = 398460096.

The previous prime is 400207949. The next prime is 400207967. The reversal of 400207957 is 759702004.

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 290566116 + 109641841 = 17046^2 + 10471^2 .

It is a cyclic number.

It is not a de Polignac number, because 400207957 - 2³ = 400207949 is a prime.

It is a super-2 number, since 2×400207957² = 320332817692227698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400207937) 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, 873588 + ... + 874045.

It is an arithmetic number, because the mean of its divisors is an integer number (100488955).

Almost surely, 2^400207957 is an apocalyptic number.

It is an amenable number.

400207957 is a deficient number, since it is larger than the sum of its proper divisors (1747863).

400207957 is a wasteful number, since it uses less digits than its factorization.

400207957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1747862.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 400207957 is about 20005.1982494551. The cubic root of 400207957 is about 736.9339642964.

The spelling of 400207957 in words is "four hundred million, two hundred seven thousand, nine hundred fifty-seven".