400838155 has 24 divisors (see below), whose sum is σ = 537557472. Its totient is φ = 285901056.

The previous prime is 400838149. The next prime is 400838159. The reversal of 400838155 is 551838004.

It is not a de Polignac number, because 400838155 - 2⁹ = 400837643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400838155.

It is not an unprimeable number, because it can be changed into a prime (400838159) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24154 + ... + 37216.

It is an arithmetic number, because the mean of its divisors is an integer number (22398228).

Almost surely, 2^400838155 is an apocalyptic number.

400838155 is a deficient number, since it is larger than the sum of its proper divisors (136719317).

400838155 is a wasteful number, since it uses less digits than its factorization.

400838155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13123 (or 13104 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 400838155 is about 20020.9429098632. The cubic root of 400838155 is about 737.3205722652.

The spelling of 400838155 in words is "four hundred million, eight hundred thirty-eight thousand, one hundred fifty-five".