400700028 has 12 divisors (see below), whose sum is σ = 934966760. Its totient is φ = 133566672.

The previous prime is 400700021. The next prime is 400700029. The reversal of 400700028 is 820007004.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 400699977 and 400700013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400700021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16695823 + ... + 16695846.

Almost surely, 2^400700028 is an apocalyptic number.

It is an amenable number.

400700028 is an abundant number, since it is smaller than the sum of its proper divisors (534266732).

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

400700028 is a wasteful number, since it uses less digits than its factorization.

400700028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33391676 (or 33391674 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 400700028 is about 20017.4930498302. The cubic root of 400700028 is about 737.2358700997.

The spelling of 400700028 in words is "four hundred million, seven hundred thousand, twenty-eight".