400401100 has 54 divisors (see below), whose sum is σ = 955068212. Its totient is φ = 145596000.

The previous prime is 400401097. The next prime is 400401103. The reversal of 400401100 is 1104004.

It is an interprime number because it is at equal distance from previous prime (400401097) and next prime (400401103).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (400401103) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 4446 + ... + 28645.

Almost surely, 2^400401100 is an apocalyptic number.

It is an amenable number.

400401100 is an abundant number, since it is smaller than the sum of its proper divisors (554667112).

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

400401100 is a wasteful number, since it uses less digits than its factorization.

400401100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33127 (or 33109 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 400401100 is about 20010.0249874906. The cubic root of 400401100 is about 737.0524949613.

Adding to 400401100 its reverse (1104004), we get a palindrome (401505104).

The spelling of 400401100 in words is "four hundred million, four hundred one thousand, one hundred".