401440279 has 2 divisors, whose sum is σ = 401440280. Its totient is φ = 401440278.

The previous prime is 401440163. The next prime is 401440283. The reversal of 401440279 is 972044104.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 401440279 - 2⁹ = 401439767 is a prime.

It is a super-2 number, since 2×401440279² = 322308595207195682, which contains 22 as substring.

It is equal to p_21408772 and since 401440279 and 21408772 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 401440279.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401440289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200720139 + 200720140.

It is an arithmetic number, because the mean of its divisors is an integer number (200720140).

Almost surely, 2^401440279 is an apocalyptic number.

401440279 is a deficient number, since it is larger than the sum of its proper divisors (1).

401440279 is an equidigital number, since it uses as much as digits as its factorization.

401440279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 401440279 is about 20035.9746206667. The cubic root of 401440279 is about 737.6895793011.

The spelling of 401440279 in words is "four hundred one million, four hundred forty thousand, two hundred seventy-nine".