642917294 has 4 divisors (see below), whose sum is σ = 964375944. Its totient is φ = 321458646.

The previous prime is 642917273. The next prime is 642917309. The reversal of 642917294 is 492719246.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160729322 + ... + 160729325.

It is an arithmetic number, because the mean of its divisors is an integer number (241093986).

Almost surely, 2^642917294 is an apocalyptic number.

642917294 is a deficient number, since it is larger than the sum of its proper divisors (321458650).

642917294 is a wasteful number, since it uses less digits than its factorization.

642917294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321458649.

The product of its digits is 217728, while the sum is 44.

The square root of 642917294 is about 25355.8138106431. The cubic root of 642917294 is about 863.0812913761.

The spelling of 642917294 in words is "six hundred forty-two million, nine hundred seventeen thousand, two hundred ninety-four".