722136 has 16 divisors (see below), whose sum is σ = 1805400. Its totient is φ = 240704.

The previous prime is 722123. The next prime is 722147. The reversal of 722136 is 631227.

It is a happy number.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 722136.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15021 + ... + 15068.

2⁷²²¹³⁶ is an apocalyptic number.

It is an amenable number.

722136 is an abundant number, since it is smaller than the sum of its proper divisors (1083264).

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

722136 is a wasteful number, since it uses less digits than its factorization.

722136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30098 (or 30094 counting only the distinct ones).

The product of its digits is 504, while the sum is 21.

The square root of 722136 is about 849.7858553777. The cubic root of 722136 is about 89.7166396551.

Subtracting from 722136 its reverse (631227), we obtain a palindrome (90909).

It can be divided in two parts, 722 and 136, that added together give a palindrome (858).

The spelling of 722136 in words is "seven hundred twenty-two thousand, one hundred thirty-six".