400109628 has 24 divisors (see below), whose sum is σ = 933948288. Its totient is φ = 133318576.

The previous prime is 400109627. The next prime is 400109629. The reversal of 400109628 is 826901004.

It is an interprime number because it is at equal distance from previous prime (400109627) and next prime (400109629).

It is a junction number, because it is equal to n+sod(n) for n = 400109595 and 400109604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400109623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38875 + ... + 48077.

It is an arithmetic number, because the mean of its divisors is an integer number (38914512).

Almost surely, 2^400109628 is an apocalyptic number.

It is an amenable number.

400109628 is an abundant number, since it is smaller than the sum of its proper divisors (533838660).

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

400109628 is a wasteful number, since it uses less digits than its factorization.

400109628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12833 (or 12831 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 400109628 is about 20002.7405122398. The cubic root of 400109628 is about 736.8736057471.

The spelling of 400109628 in words is "four hundred million, one hundred nine thousand, six hundred twenty-eight".