402124279 has 2 divisors, whose sum is σ = 402124280. Its totient is φ = 402124278.

The previous prime is 402124277. The next prime is 402124309. The reversal of 402124279 is 972421204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402124279 - 2¹ = 402124277 is a prime.

It is a super-2 number, since 2×402124279² = 323407871522539682, which contains 22 as substring.

Together with 402124277, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 402124279.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402124271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201062139 + 201062140.

It is an arithmetic number, because the mean of its divisors is an integer number (201062140).

Almost surely, 2^402124279 is an apocalyptic number.

402124279 is a deficient number, since it is larger than the sum of its proper divisors (1).

402124279 is an equidigital number, since it uses as much as digits as its factorization.

402124279 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 402124279 is about 20053.0366528364. The cubic root of 402124279 is about 738.1083160274.

The spelling of 402124279 in words is "four hundred two million, one hundred twenty-four thousand, two hundred seventy-nine".