18459945 has 24 divisors (see below), whose sum is σ = 36568896. Its totient is φ = 8438688.

The previous prime is 18459941. The next prime is 18459949. The reversal of 18459945 is 54995481.

18459945 = T₄₅₄ + T₄₅₅ + ... + T₅₈₈.

18459945 is a `hidden beast` number, since 18 + 4 + 599 + 45 = 666.

It is an interprime number because it is at equal distance from previous prime (18459941) and next prime (18459949).

It is not a de Polignac number, because 18459945 - 2² = 18459941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 18459945.

It is not an unprimeable number, because it can be changed into a prime (18459941) 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, 28987 + ... + 29616.

It is an arithmetic number, because the mean of its divisors is an integer number (1523704).

Almost surely, 2^18459945 is an apocalyptic number.

18459945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18459945 is a deficient number, since it is larger than the sum of its proper divisors (18108951).

18459945 is a wasteful number, since it uses less digits than its factorization.

18459945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58621 (or 58618 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 18459945 is about 4296.5038112400. The cubic root of 18459945 is about 264.2876083902.

The spelling of 18459945 in words is "eighteen million, four hundred fifty-nine thousand, nine hundred forty-five".