402420239 has 4 divisors (see below), whose sum is σ = 433375656. Its totient is φ = 371464824.

The previous prime is 402420229. The next prime is 402420253. The reversal of 402420239 is 932024204.

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 402420239 - 2⁴ = 402420223 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 (402420229) 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, 15477689 + ... + 15477714.

It is an arithmetic number, because the mean of its divisors is an integer number (108343914).

Almost surely, 2^402420239 is an apocalyptic number.

402420239 is a deficient number, since it is larger than the sum of its proper divisors (30955417).

402420239 is a wasteful number, since it uses less digits than its factorization.

402420239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30955416.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 402420239 is about 20060.4147265205. The cubic root of 402420239 is about 738.2893520719.

The spelling of 402420239 in words is "four hundred two million, four hundred twenty thousand, two hundred thirty-nine".