400625155 has 16 divisors (see below), whose sum is σ = 573318144. Its totient is φ = 262769760.

The previous prime is 400625153. The next prime is 400625167. The reversal of 400625155 is 551526004.

400625155 = T₃₈₄ + T₃₈₅ + ... + T₁₃₄₉.

It is not a de Polignac number, because 400625155 - 2¹ = 400625153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400625153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248031 + ... + 249640.

It is an arithmetic number, because the mean of its divisors is an integer number (35832384).

Almost surely, 2^400625155 is an apocalyptic number.

400625155 is a deficient number, since it is larger than the sum of its proper divisors (172692989).

400625155 is a wasteful number, since it uses less digits than its factorization.

400625155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497706.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 400625155 is about 20015.6227732239. The cubic root of 400625155 is about 737.1899483828.

It can be divided in two parts, 4006 and 25155, that added together give a triangular number (29161 = T₂₄₁).

The spelling of 400625155 in words is "four hundred million, six hundred twenty-five thousand, one hundred fifty-five".