401666013 has 32 divisors (see below), whose sum is σ = 682859520. Its totient is φ = 228582000.

The previous prime is 401666009. The next prime is 401666047. The reversal of 401666013 is 310666104.

It is not a de Polignac number, because 401666013 - 2² = 401666009 is a prime.

It is a super-2 number, since 2×401666013² = 322671171998632338, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401666093) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43206 + ... + 51672.

It is an arithmetic number, because the mean of its divisors is an integer number (21339360).

Almost surely, 2^401666013 is an apocalyptic number.

It is an amenable number.

401666013 is a deficient number, since it is larger than the sum of its proper divisors (281193507).

401666013 is a wasteful number, since it uses less digits than its factorization.

401666013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8734 (or 8728 counting only the distinct ones).

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

The square root of 401666013 is about 20041.6070463424. The cubic root of 401666013 is about 737.8278235396.

Subtracting from 401666013 its reverse (310666104), we obtain a palindrome (90999909).

The spelling of 401666013 in words is "four hundred one million, six hundred sixty-six thousand, thirteen".