18752121 has 8 divisors (see below), whose sum is σ = 27780960. Its totient is φ = 12501396.

The previous prime is 18752113. The next prime is 18752131. The reversal of 18752121 is 12125781.

It is not a de Polignac number, because 18752121 - 2³ = 18752113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 694523 = 18752121 / (1 + 8 + 7 + 5 + 2 + 1 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (18752131) 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, 347235 + ... + 347288.

It is an arithmetic number, because the mean of its divisors is an integer number (3472620).

Almost surely, 2^18752121 is an apocalyptic number.

It is an amenable number.

18752121 is a deficient number, since it is larger than the sum of its proper divisors (9028839).

18752121 is an equidigital number, since it uses as much as digits as its factorization.

18752121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694532 (or 694526 counting only the distinct ones).

The product of its digits is 1120, while the sum is 27.

The square root of 18752121 is about 4330.3719239807. The cubic root of 18752121 is about 265.6746592461.

The spelling of 18752121 in words is "eighteen million, seven hundred fifty-two thousand, one hundred twenty-one".