400168428 has 24 divisors (see below), whose sum is σ = 1018610880. Its totient is φ = 121263120.

The previous prime is 400168411. The next prime is 400168459. The reversal of 400168428 is 824861004.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1515658 + ... + 1515921.

It is an arithmetic number, because the mean of its divisors is an integer number (42442120).

Almost surely, 2^400168428 is an apocalyptic number.

It is an amenable number.

400168428 is an abundant number, since it is smaller than the sum of its proper divisors (618442452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400168428 is a wasteful number, since it uses less digits than its factorization.

400168428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3031597 (or 3031595 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 400168428 is about 20004.2102568434. The cubic root of 400168428 is about 736.9097008926.

The spelling of 400168428 in words is "four hundred million, one hundred sixty-eight thousand, four hundred twenty-eight".