400623257 has 4 divisors (see below), whose sum is σ = 400669236. Its totient is φ = 400577280.

The previous prime is 400623239. The next prime is 400623263. The reversal of 400623257 is 752326004.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 307616521 + 93006736 = 17539^2 + 9644^2 .

It is a cyclic number.

It is not a de Polignac number, because 400623257 - 2⁸ = 400623001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400623557) 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, 5468 + ... + 28829.

It is an arithmetic number, because the mean of its divisors is an integer number (100167309).

Almost surely, 2^400623257 is an apocalyptic number.

It is an amenable number.

400623257 is a deficient number, since it is larger than the sum of its proper divisors (45979).

400623257 is a wasteful number, since it uses less digits than its factorization.

400623257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45978.

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 400623257 is about 20015.5753602039. The cubic root of 400623257 is about 737.1887842117.

The spelling of 400623257 in words is "four hundred million, six hundred twenty-three thousand, two hundred fifty-seven".