400606251 has 8 divisors (see below), whose sum is σ = 534504000. Its totient is φ = 266889672.

The previous prime is 400606247. The next prime is 400606259. The reversal of 400606251 is 152606004.

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

It is not a de Polignac number, because 400606251 - 2² = 400606247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400606259) 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, 40045 + ... + 49038.

It is an arithmetic number, because the mean of its divisors is an integer number (66813000).

Almost surely, 2^400606251 is an apocalyptic number.

400606251 is a deficient number, since it is larger than the sum of its proper divisors (133897749).

400606251 is a wasteful number, since it uses less digits than its factorization.

400606251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90585.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 400606251 is about 20015.1505365311. The cubic root of 400606251 is about 737.1783531232.

It can be divided in two parts, 400 and 606251, that added together give a triangular number (606651 = T₁₁₀₁).

The spelling of 400606251 in words is "four hundred million, six hundred six thousand, two hundred fifty-one".