401664139 has 2 divisors, whose sum is σ = 401664140. Its totient is φ = 401664138.

The previous prime is 401664121. The next prime is 401664143. The reversal of 401664139 is 931466104.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 401664139 - 2¹¹ = 401662091 is a prime.

It is a super-2 number, since 2×401664139² = 322668161117222642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (401664149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200832069 + 200832070.

It is an arithmetic number, because the mean of its divisors is an integer number (200832070).

Almost surely, 2^401664139 is an apocalyptic number.

401664139 is a deficient number, since it is larger than the sum of its proper divisors (1).

401664139 is an equidigital number, since it uses as much as digits as its factorization.

401664139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 401664139 is about 20041.5602935500. The cubic root of 401664139 is about 737.8266760759.

The spelling of 401664139 in words is "four hundred one million, six hundred sixty-four thousand, one hundred thirty-nine".