400491630 has 96 divisors (see below), whose sum is σ = 1298239488. Its totient is φ = 83217600.

The previous prime is 400491613. The next prime is 400491667. The reversal of 400491630 is 36194004.

It is a junction number, because it is equal to n+sod(n) for n = 400491594 and 400491603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21966 + ... + 35825.

It is an arithmetic number, because the mean of its divisors is an integer number (13523328).

Almost surely, 2^400491630 is an apocalyptic number.

400491630 is an abundant number, since it is smaller than the sum of its proper divisors (897747858).

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

400491630 is a wasteful number, since it uses less digits than its factorization.

400491630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57822 (or 57819 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 400491630 is about 20012.2869757557. The cubic root of 400491630 is about 737.1080395425.

The spelling of 400491630 in words is "four hundred million, four hundred ninety-one thousand, six hundred thirty".