401465638 has 16 divisors (see below), whose sum is σ = 693181440. Its totient is φ = 170818056.

The previous prime is 401465627. The next prime is 401465641. The reversal of 401465638 is 836564104.

It is a happy number.

It is a super-2 number, since 2×401465638² = 322349316989494088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 401465597 and 401465606.

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 7 ways as a sum of consecutive naturals, for example, 101206 + ... + 105097.

It is an arithmetic number, because the mean of its divisors is an integer number (43323840).

Almost surely, 2^401465638 is an apocalyptic number.

401465638 is a deficient number, since it is larger than the sum of its proper divisors (291715802).

401465638 is a wasteful number, since it uses less digits than its factorization.

401465638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206451.

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 401465638 is about 20036.6074473699. The cubic root of 401465638 is about 737.7051122684.

The spelling of 401465638 in words is "four hundred one million, four hundred sixty-five thousand, six hundred thirty-eight".