723612 has 24 divisors (see below), whose sum is σ = 1725696. Its totient is φ = 235888.

The previous prime is 723607. The next prime is 723617. The reversal of 723612 is 216327.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (723607) and next prime (723617).

It is a super-2 number, since 2×723612² = 1047228653088, which contains 22 as substring.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78 + ... + 1205.

It is an arithmetic number, because the mean of its divisors is an integer number (71904).

2⁷²³⁶¹² is an apocalyptic number.

It is an amenable number.

723612 is an abundant number, since it is smaller than the sum of its proper divisors (1002084).

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

723612 is a wasteful number, since it uses less digits than its factorization.

723612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337 (or 1335 counting only the distinct ones).

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

The square root of 723612 is about 850.6538661524. The cubic root of 723612 is about 89.7777230899. Note that the first 4 decimals are identical.

Adding to 723612 its reverse (216327), we get a palindrome (939939).

The spelling of 723612 in words is "seven hundred twenty-three thousand, six hundred twelve".