400154155 has 16 divisors (see below), whose sum is σ = 506167200. Its totient is φ = 302849280.

The previous prime is 400154141. The next prime is 400154159. The reversal of 400154155 is 551451004.

It is a happy number.

It is not a de Polignac number, because 400154155 - 2⁹ = 400153643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400154159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76215 + ... + 81295.

It is an arithmetic number, because the mean of its divisors is an integer number (31635450).

Almost surely, 2^400154155 is an apocalyptic number.

400154155 is a deficient number, since it is larger than the sum of its proper divisors (106013045).

400154155 is a wasteful number, since it uses less digits than its factorization.

400154155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5934.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 400154155 is about 20003.8535037627. The cubic root of 400154155 is about 736.9009395507.

The spelling of 400154155 in words is "four hundred million, one hundred fifty-four thousand, one hundred fifty-five".