401644379 has 2 divisors, whose sum is σ = 401644380. Its totient is φ = 401644378.

The previous prime is 401644307. The next prime is 401644391. The reversal of 401644379 is 973446104.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 401644379 - 2²⁴ = 384867163 is a prime.

It is a super-2 number, since 2×401644379² = 322636414364591282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (401644079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200822189 + 200822190.

It is an arithmetic number, because the mean of its divisors is an integer number (200822190).

Almost surely, 2^401644379 is an apocalyptic number.

401644379 is a deficient number, since it is larger than the sum of its proper divisors (1).

401644379 is an equidigital number, since it uses as much as digits as its factorization.

401644379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 401644379 is about 20041.0673118973. The cubic root of 401644379 is about 737.8145766685.

The spelling of 401644379 in words is "four hundred one million, six hundred forty-four thousand, three hundred seventy-nine".