18844426 has 4 divisors (see below), whose sum is σ = 28266642. Its totient is φ = 9422212.

The previous prime is 18844417. The next prime is 18844457. The reversal of 18844426 is 62444881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62444881 = 31 ⋅2014351.

It can be written as a sum of positive squares in only one way, i.e., 16281225 + 2563201 = 4035^2 + 1601^2 .

It is a super-2 number, since 2×18844426² = 710224782538952, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4711105 + ... + 4711108.

Almost surely, 2^18844426 is an apocalyptic number.

18844426 is the 2746-th centered pentagonal number.

18844426 is a deficient number, since it is larger than the sum of its proper divisors (9422216).

18844426 is an equidigital number, since it uses as much as digits as its factorization.

18844426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9422215.

The product of its digits is 49152, while the sum is 37.

The square root of 18844426 is about 4341.0167011888. The cubic root of 18844426 is about 266.1098628476.

The spelling of 18844426 in words is "eighteen million, eight hundred forty-four thousand, four hundred twenty-six".