18039465 has 24 divisors (see below), whose sum is σ = 33109128. Its totient is φ = 9054720.

The previous prime is 18039449. The next prime is 18039491. The reversal of 18039465 is 56493081.

It can be written as a sum of positive squares in 4 ways, for example, as 2143296 + 15896169 = 1464^2 + 3987^2 .

It is not a de Polignac number, because 18039465 - 2⁴ = 18039449 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11026 + ... + 12555.

It is an arithmetic number, because the mean of its divisors is an integer number (1379547).

Almost surely, 2^18039465 is an apocalyptic number.

18039465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18039465 is a deficient number, since it is larger than the sum of its proper divisors (15069663).

18039465 is a wasteful number, since it uses less digits than its factorization.

18039465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23609 (or 23606 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 18039465 is about 4247.2891354369. The cubic root of 18039465 is about 262.2655321297.

The spelling of 18039465 in words is "eighteen million, thirty-nine thousand, four hundred sixty-five".