18440628 has 12 divisors (see below), whose sum is σ = 43028160. Its totient is φ = 6146872.

The previous prime is 18440623. The next prime is 18440633. The reversal of 18440628 is 82604481.

It is an interprime number because it is at equal distance from previous prime (18440623) and next prime (18440633).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×18440628² = 680113522068768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18440623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 768348 + ... + 768371.

It is an arithmetic number, because the mean of its divisors is an integer number (3585680).

Almost surely, 2^18440628 is an apocalyptic number.

It is an amenable number.

18440628 is an abundant number, since it is smaller than the sum of its proper divisors (24587532).

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

18440628 is a wasteful number, since it uses less digits than its factorization.

18440628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536726 (or 1536724 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 18440628 is about 4294.2552322842. The cubic root of 18440628 is about 264.1953902476.

The spelling of 18440628 in words is "eighteen million, four hundred forty thousand, six hundred twenty-eight".