642142799 has 4 divisors (see below), whose sum is σ = 642311064. Its totient is φ = 641974536.

The previous prime is 642142777. The next prime is 642142801. The reversal of 642142799 is 997241246.

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 642142799 - 2¹² = 642138703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642142499) 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, 78272 + ... + 86085.

It is an arithmetic number, because the mean of its divisors is an integer number (160577766).

Almost surely, 2^642142799 is an apocalyptic number.

642142799 is a deficient number, since it is larger than the sum of its proper divisors (168265).

642142799 is a wasteful number, since it uses less digits than its factorization.

642142799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168264.

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

The square root of 642142799 is about 25340.5366754534. The cubic root of 642142799 is about 862.7345797283.

The spelling of 642142799 in words is "six hundred forty-two million, one hundred forty-two thousand, seven hundred ninety-nine".