401615644 has 6 divisors (see below), whose sum is σ = 702827384. Its totient is φ = 200807820.

The previous prime is 401615629. The next prime is 401615663. The reversal of 401615644 is 446516104.

It is a super-2 number, since 2×401615644² = 322590251011069472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50201952 + ... + 50201959.

Almost surely, 2^401615644 is an apocalyptic number.

It is an amenable number.

401615644 is a deficient number, since it is larger than the sum of its proper divisors (301211740).

401615644 is a wasteful number, since it uses less digits than its factorization.

401615644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100403915 (or 100403913 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 401615644 is about 20040.3503961383. The cubic root of 401615644 is about 737.7969809971.

The spelling of 401615644 in words is "four hundred one million, six hundred fifteen thousand, six hundred forty-four".