400706257 has 16 divisors (see below), whose sum is σ = 483030400. Its totient is φ = 324725760.

The previous prime is 400706237. The next prime is 400706287. The reversal of 400706257 is 752607004.

It is a cyclic number.

It is not a de Polignac number, because 400706257 - 2¹⁵ = 400673489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400706227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69169 + ... + 74737.

It is an arithmetic number, because the mean of its divisors is an integer number (30189400).

Almost surely, 2^400706257 is an apocalyptic number.

It is an amenable number.

400706257 is a deficient number, since it is larger than the sum of its proper divisors (82324143).

400706257 is a wasteful number, since it uses less digits than its factorization.

400706257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6136.

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 400706257 is about 20017.6486381393. The cubic root of 400706257 is about 737.2396902628.

The spelling of 400706257 in words is "four hundred million, seven hundred six thousand, two hundred fifty-seven".