400155424 has 24 divisors (see below), whose sum is σ = 793482480. Its totient is φ = 198636096.

The previous prime is 400155421. The next prime is 400155433. The reversal of 400155424 is 424551004.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (400155421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40534 + ... + 49429.

It is an arithmetic number, because the mean of its divisors is an integer number (33061770).

Almost surely, 2^400155424 is an apocalyptic number.

It is an amenable number.

400155424 is a deficient number, since it is larger than the sum of its proper divisors (393327056).

400155424 is a wasteful number, since it uses less digits than its factorization.

400155424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90112 (or 90104 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 400155424 is about 20003.8852226261. The cubic root of 400155424 is about 736.9017185224.

The spelling of 400155424 in words is "four hundred million, one hundred fifty-five thousand, four hundred twenty-four".