723581442 has 12 divisors (see below), whose sum is σ = 1567759830. Its totient is φ = 241193808.

The previous prime is 723581431. The next prime is 723581471. The reversal of 723581442 is 244185327.

It is a happy number.

723581442 is a `hidden beast` number, since 72 + 3 + 581 + 4 + 4 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 703787841 + 19793601 = 26529^2 + 4449^2 .

It is a junction number, because it is equal to n+sod(n) for n = 723581397 and 723581406.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20099467 + ... + 20099502.

Almost surely, 2^723581442 is an apocalyptic number.

723581442 is an abundant number, since it is smaller than the sum of its proper divisors (844178388).

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

723581442 is a wasteful number, since it uses less digits than its factorization.

723581442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40198977 (or 40198974 counting only the distinct ones).

The product of its digits is 53760, while the sum is 36.

The square root of 723581442 is about 26899.4691769187. The cubic root of 723581442 is about 897.7645930663.

The spelling of 723581442 in words is "seven hundred twenty-three million, five hundred eighty-one thousand, four hundred forty-two".