642389392 has 30 divisors (see below), whose sum is σ = 1313595798. Its totient is φ = 304286976.

The previous prime is 642389389. The next prime is 642389393. The reversal of 642389392 is 293983246.

It can be written as a sum of positive squares in only one way, i.e., 606341376 + 36048016 = 24624^2 + 6004^2 .

It is not an unprimeable number, because it can be changed into a prime (642389393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49833 + ... + 61384.

Almost surely, 2^642389392 is an apocalyptic number.

It is an amenable number.

642389392 is an abundant number, since it is smaller than the sum of its proper divisors (671206406).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642389392 is a wasteful number, since it uses less digits than its factorization.

642389392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111263 (or 111238 counting only the distinct ones).

The product of its digits is 559872, while the sum is 46.

The square root of 642389392 is about 25345.4017920411. The cubic root of 642389392 is about 862.8450001737.

The spelling of 642389392 in words is "six hundred forty-two million, three hundred eighty-nine thousand, three hundred ninety-two".