18072831 has 16 divisors (see below), whose sum is σ = 27661568. Its totient is φ = 10281600.

The previous prime is 18072827. The next prime is 18072833. The reversal of 18072831 is 13827081.

It is a happy number.

It is not a de Polignac number, because 18072831 - 2² = 18072827 is a prime.

It is a super-2 number, since 2×18072831² = 653254440709122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18072833) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3276 + ... + 6846.

It is an arithmetic number, because the mean of its divisors is an integer number (1728848).

Almost surely, 2^18072831 is an apocalyptic number.

18072831 is a deficient number, since it is larger than the sum of its proper divisors (9588737).

18072831 is a wasteful number, since it uses less digits than its factorization.

18072831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3822.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 18072831 is about 4251.2152380231. The cubic root of 18072831 is about 262.4271289789.

The spelling of 18072831 in words is "eighteen million, seventy-two thousand, eight hundred thirty-one".