400496557 has 8 divisors (see below), whose sum is σ = 426509496. Its totient is φ = 374756352.

The previous prime is 400496531. The next prime is 400496563. The reversal of 400496557 is 755694004.

It can be written as a sum of positive squares in 4 ways, for example, as 337309956 + 63186601 = 18366^2 + 7949^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400496557 - 2²³ = 392107949 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 (400496507) 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, 65148 + ... + 71029.

It is an arithmetic number, because the mean of its divisors is an integer number (53313687).

Almost surely, 2^400496557 is an apocalyptic number.

It is an amenable number.

400496557 is a deficient number, since it is larger than the sum of its proper divisors (26012939).

400496557 is a wasteful number, since it uses less digits than its factorization.

400496557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136367.

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 400496557 is about 20012.4100747511. The cubic root of 400496557 is about 737.1110622577. Note that the first 3 decimals are identical.

The spelling of 400496557 in words is "four hundred million, four hundred ninety-six thousand, five hundred fifty-seven".