401993390 has 16 divisors (see below), whose sum is σ = 766152432. Its totient is φ = 151338624.

The previous prime is 401993387. The next prime is 401993401. The reversal of 401993390 is 93399104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1182164 + ... + 1182503.

It is an arithmetic number, because the mean of its divisors is an integer number (47884527).

Almost surely, 2^401993390 is an apocalyptic number.

401993390 is a deficient number, since it is larger than the sum of its proper divisors (364159042).

401993390 is a wasteful number, since it uses less digits than its factorization.

401993390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2364691.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 401993390 is about 20049.7728166680. The cubic root of 401993390 is about 738.0282240854.

The spelling of 401993390 in words is "four hundred one million, nine hundred ninety-three thousand, three hundred ninety".