401331630 has 32 divisors (see below), whose sum is σ = 1100795904. Its totient is φ = 91732896.

The previous prime is 401331607. The next prime is 401331647. The reversal of 401331630 is 36133104.

It is a super-2 number, since 2×401331630² = 322134154476913800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 401331597 and 401331606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 955342 + ... + 955761.

It is an arithmetic number, because the mean of its divisors is an integer number (34399872).

Almost surely, 2^401331630 is an apocalyptic number.

401331630 is an abundant number, since it is smaller than the sum of its proper divisors (699464274).

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

401331630 is a wasteful number, since it uses less digits than its factorization.

401331630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911120.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 401331630 is about 20033.2630891725. The cubic root of 401331630 is about 737.6230218984.

Adding to 401331630 its reverse (36133104), we get a palindrome (437464734).

The spelling of 401331630 in words is "four hundred one million, three hundred thirty-one thousand, six hundred thirty".