400920630 has 64 divisors (see below), whose sum is σ = 1065408768. Its totient is φ = 95736960.

The previous prime is 400920629. The next prime is 400920647. The reversal of 400920630 is 36029004.

It is a self number, because there is not a number n which added to its sum of digits gives 400920630.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13044 + ... + 31176.

It is an arithmetic number, because the mean of its divisors is an integer number (16647012).

Almost surely, 2^400920630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400920630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (532704384).

400920630 is an abundant number, since it is smaller than the sum of its proper divisors (664488138).

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

400920630 is a wasteful number, since it uses less digits than its factorization.

400920630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18221.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 400920630 is about 20023.0025220994. The cubic root of 400920630 is about 737.3711382631.

Adding to 400920630 its reverse (36029004), we get a palindrome (436949634).

The spelling of 400920630 in words is "four hundred million, nine hundred twenty thousand, six hundred thirty".