402066839 has 4 divisors (see below), whose sum is σ = 402390000. Its totient is φ = 401743680.

The previous prime is 402066829. The next prime is 402066853. The reversal of 402066839 is 938660204.

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 402066839 - 2⁸ = 402066583 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 (402066829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159707 + ... + 162204.

It is an arithmetic number, because the mean of its divisors is an integer number (100597500).

Almost surely, 2^402066839 is an apocalyptic number.

402066839 is a deficient number, since it is larger than the sum of its proper divisors (323161).

402066839 is a wasteful number, since it uses less digits than its factorization.

402066839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323160.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 402066839 is about 20051.6043996484. The cubic root of 402066839 is about 738.0731702091.

The spelling of 402066839 in words is "four hundred two million, sixty-six thousand, eight hundred thirty-nine".