18621473 has 8 divisors (see below), whose sum is σ = 20250048. Its totient is φ = 17020944.

The previous prime is 18621469. The next prime is 18621479. The reversal of 18621473 is 37412681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18621473 - 2² = 18621469 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18621479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5615 + ... + 8292.

It is an arithmetic number, because the mean of its divisors is an integer number (2531256).

Almost surely, 2^18621473 is an apocalyptic number.

18621473 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18621473 is a deficient number, since it is larger than the sum of its proper divisors (1628575).

18621473 is a wasteful number, since it uses less digits than its factorization.

18621473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14023.

The product of its digits is 8064, while the sum is 32.

The square root of 18621473 is about 4315.2604788124. The cubic root of 18621473 is about 265.0562263510.

The spelling of 18621473 in words is "eighteen million, six hundred twenty-one thousand, four hundred seventy-three".