18274436 has 6 divisors (see below), whose sum is σ = 31980270. Its totient is φ = 9137216.

The previous prime is 18274433. The next prime is 18274463. The reversal of 18274436 is 63447281.

It can be written as a sum of positive squares in only one way, i.e., 10601536 + 7672900 = 3256^2 + 2770^2 .

It is a super-2 number, since 2×18274436² = 667910022236192, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18274396 and 18274405.

It is not an unprimeable number, because it can be changed into a prime (18274433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2284301 + ... + 2284308.

It is an arithmetic number, because the mean of its divisors is an integer number (5330045).

Almost surely, 2^18274436 is an apocalyptic number.

It is an amenable number.

18274436 is a deficient number, since it is larger than the sum of its proper divisors (13705834).

18274436 is a wasteful number, since it uses less digits than its factorization.

18274436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4568613 (or 4568611 counting only the distinct ones).

The product of its digits is 32256, while the sum is 35.

The square root of 18274436 is about 4274.8609334106. The cubic root of 18274436 is about 263.3993268702.

The spelling of 18274436 in words is "eighteen million, two hundred seventy-four thousand, four hundred thirty-six".