400137628 has 24 divisors (see below), whose sum is σ = 771047424. Its totient is φ = 180178800.

The previous prime is 400137623. The next prime is 400137629. The reversal of 400137628 is 826731004.

It is a super-2 number, since 2×400137628² = 320220242682932768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 400137628.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400137623) 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, 37788 + ... + 47203.

It is an arithmetic number, because the mean of its divisors is an integer number (32126976).

Almost surely, 2^400137628 is an apocalyptic number.

It is an amenable number.

400137628 is a deficient number, since it is larger than the sum of its proper divisors (370909796).

400137628 is a wasteful number, since it uses less digits than its factorization.

400137628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85113 (or 85111 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 400137628 is about 20003.4404040905. The cubic root of 400137628 is about 736.8907943526.

The spelling of 400137628 in words is "four hundred million, one hundred thirty-seven thousand, six hundred twenty-eight".