18487945 has 24 divisors (see below), whose sum is σ = 26265600. Its totient is φ = 12452832.

The previous prime is 18487943. The next prime is 18487951. The reversal of 18487945 is 54978481.

It is not a de Polignac number, because 18487945 - 2¹ = 18487943 is a prime.

It is a super-2 number, since 2×18487945² = 683608220646050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18487895 and 18487904.

It is not an unprimeable number, because it can be changed into a prime (18487943) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13816 + ... + 15094.

It is an arithmetic number, because the mean of its divisors is an integer number (1094400).

Almost surely, 2^18487945 is an apocalyptic number.

It is an amenable number.

18487945 is a deficient number, since it is larger than the sum of its proper divisors (7777655).

18487945 is a wasteful number, since it uses less digits than its factorization.

18487945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357 (or 1350 counting only the distinct ones).

The product of its digits is 322560, while the sum is 46.

The square root of 18487945 is about 4299.7610398719. The cubic root of 18487945 is about 264.4211644892.

The spelling of 18487945 in words is "eighteen million, four hundred eighty-seven thousand, nine hundred forty-five".