18469621 has 4 divisors (see below), whose sum is σ = 19272672. Its totient is φ = 17666572.

The previous prime is 18469613. The next prime is 18469687. The reversal of 18469621 is 12696481.

It is a happy number.

It is the 1755-th star number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18469621 - 2³ = 18469613 is a prime.

It is a super-2 number, since 2×18469621² = 682253799767282, 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 (18469921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 401491 + ... + 401536.

It is an arithmetic number, because the mean of its divisors is an integer number (4818168).

Almost surely, 2^18469621 is an apocalyptic number.

It is an amenable number.

18469621 is a deficient number, since it is larger than the sum of its proper divisors (803051).

18469621 is an equidigital number, since it uses as much as digits as its factorization.

18469621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803050.

The product of its digits is 20736, while the sum is 37.

The square root of 18469621 is about 4297.6296955415. The cubic root of 18469621 is about 264.3337768236. Note that the first 3 decimals are identical.

The spelling of 18469621 in words is "eighteen million, four hundred sixty-nine thousand, six hundred twenty-one".