402407279 has 4 divisors (see below), whose sum is σ = 410969184. Its totient is φ = 393845376.

The previous prime is 402407267. The next prime is 402407303. The reversal of 402407279 is 972704204.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 402407279 - 2²⁸ = 133971823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402407209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4280882 + ... + 4280975.

It is an arithmetic number, because the mean of its divisors is an integer number (102742296).

Almost surely, 2^402407279 is an apocalyptic number.

402407279 is a deficient number, since it is larger than the sum of its proper divisors (8561905).

402407279 is an equidigital number, since it uses as much as digits as its factorization.

402407279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8561904.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 402407279 is about 20060.0916996907. The cubic root of 402407279 is about 738.2814264162.

The spelling of 402407279 in words is "four hundred two million, four hundred seven thousand, two hundred seventy-nine".