642136 has 16 divisors (see below), whose sum is σ = 1313640. Its totient is φ = 291840.

The previous prime is 642133. The next prime is 642149. The reversal of 642136 is 631246.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642133) 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, 3561 + ... + 3736.

2⁶⁴²¹³⁶ is an apocalyptic number.

It is an amenable number.

642136 is an abundant number, since it is smaller than the sum of its proper divisors (671504).

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

642136 is a wasteful number, since it uses less digits than its factorization.

642136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7314 (or 7310 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

The square root of 642136 is about 801.3338879643. Note that the first 3 decimals coincide. The cubic root of 642136 is about 86.2731534843.

The spelling of 642136 in words is "six hundred forty-two thousand, one hundred thirty-six".