642699 has 6 divisors (see below), whose sum is σ = 928356. Its totient is φ = 428460.

The previous prime is 642683. The next prime is 642701. The reversal of 642699 is 996246.

642699 is a `hidden beast` number, since 642 + 6 + 9 + 9 = 666.

It is not a de Polignac number, because 642699 - 2⁴ = 642683 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642699.

It is not an unprimeable number, because it can be changed into a prime (642199) 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, 35697 + ... + 35714.

It is an arithmetic number, because the mean of its divisors is an integer number (154726).

2⁶⁴²⁶⁹⁹ is an apocalyptic number.

642699 is a deficient number, since it is larger than the sum of its proper divisors (285657).

642699 is a wasteful number, since it uses less digits than its factorization.

642699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71417 (or 71414 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 642699 is about 801.6851002732. The cubic root of 642699 is about 86.2983597735.

The spelling of 642699 in words is "six hundred forty-two thousand, six hundred ninety-nine".