642369243 has 4 divisors (see below), whose sum is σ = 856492328. Its totient is φ = 428246160.

The previous prime is 642369239. The next prime is 642369253. The reversal of 642369243 is 342963246.

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

It is not a de Polignac number, because 642369243 - 2² = 642369239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642369253) 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, 107061538 + ... + 107061543.

It is an arithmetic number, because the mean of its divisors is an integer number (214123082).

Almost surely, 2^642369243 is an apocalyptic number.

642369243 is a deficient number, since it is larger than the sum of its proper divisors (214123085).

642369243 is a wasteful number, since it uses less digits than its factorization.

642369243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214123084.

The product of its digits is 186624, while the sum is 39.

The square root of 642369243 is about 25345.0043006507. The cubic root of 642369243 is about 862.8359788304.

The spelling of 642369243 in words is "six hundred forty-two million, three hundred sixty-nine thousand, two hundred forty-three".