402789939 has 4 divisors (see below), whose sum is σ = 537053256. Its totient is φ = 268526624.

The previous prime is 402789929. The next prime is 402789967. The reversal of 402789939 is 939987204.

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 402789939 - 2⁷ = 402789811 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 402789891 and 402789900.

It is not an unprimeable number, because it can be changed into a prime (402789929) 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, 67131654 + ... + 67131659.

It is an arithmetic number, because the mean of its divisors is an integer number (134263314).

Almost surely, 2^402789939 is an apocalyptic number.

402789939 is a deficient number, since it is larger than the sum of its proper divisors (134263317).

402789939 is a wasteful number, since it uses less digits than its factorization.

402789939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134263316.

The product of its (nonzero) digits is 979776, while the sum is 51.

The square root of 402789939 is about 20069.6272760607. The cubic root of 402789939 is about 738.5153695576.

The spelling of 402789939 in words is "four hundred two million, seven hundred eighty-nine thousand, nine hundred thirty-nine".