402738839 has 4 divisors (see below), whose sum is σ = 423935640. Its totient is φ = 381542040.

The previous prime is 402738829. The next prime is 402738841. The reversal of 402738839 is 938837204.

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

It is not a de Polignac number, because 402738839 - 2¹⁶ = 402673303 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 402738839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402738829) 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, 10598372 + ... + 10598409.

It is an arithmetic number, because the mean of its divisors is an integer number (105983910).

Almost surely, 2^402738839 is an apocalyptic number.

402738839 is a deficient number, since it is larger than the sum of its proper divisors (21196801).

402738839 is a wasteful number, since it uses less digits than its factorization.

402738839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21196800.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 402738839 is about 20068.3541676940. The cubic root of 402738839 is about 738.4841376194.

The spelling of 402738839 in words is "four hundred two million, seven hundred thirty-eight thousand, eight hundred thirty-nine".