400020100 has 36 divisors (see below), whose sum is σ = 869194368. Its totient is φ = 159796000.

The previous prime is 400020031. The next prime is 400020109. The reversal of 400020100 is 1020004.

It is not an unprimeable number, because it can be changed into a prime (400020109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88905 + ... + 93295.

It is an arithmetic number, because the mean of its divisors is an integer number (24144288).

Almost surely, 2^400020100 is an apocalyptic number.

It is an amenable number.

400020100 is an abundant number, since it is smaller than the sum of its proper divisors (469174268).

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

400020100 is a wasteful number, since it uses less digits than its factorization.

400020100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5316 (or 5309 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 400020100 is about 20000.5024936875. The cubic root of 400020100 is about 736.8186410269.

Adding to 400020100 its reverse (1020004), we get a palindrome (401040104).

The spelling of 400020100 in words is "four hundred million, twenty thousand, one hundred".