392039989 has 4 divisors (see below), whose sum is σ = 427680000. Its totient is φ = 356399980.

The previous prime is 392039933. The next prime is 392040001. The reversal of 392039989 is 989930293.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 392039989 - 2¹⁹ = 391515701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (392039929) 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, 17819989 + ... + 17820010.

It is an arithmetic number, because the mean of its divisors is an integer number (106920000).

Almost surely, 2^392039989 is an apocalyptic number.

It is an amenable number.

392039989 is a deficient number, since it is larger than the sum of its proper divisors (35640011).

392039989 is a wasteful number, since it uses less digits than its factorization.

392039989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35640010.

The product of its (nonzero) digits is 944784, while the sum is 52.

The square root of 392039989 is about 19799.9997222222. Note that the first 3 decimals coincide. The cubic root of 392039989 is about 731.8860275489.

The spelling of 392039989 in words is "three hundred ninety-two million, thirty-nine thousand, nine hundred eighty-nine".