18047913 has 16 divisors (see below), whose sum is σ = 26549376. Its totient is φ = 10834560.

The previous prime is 18047903. The next prime is 18047933. The reversal of 18047913 is 31974081.

It is not a de Polignac number, because 18047913 - 2²¹ = 15950761 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18047903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4045 + ... + 7242.

It is an arithmetic number, because the mean of its divisors is an integer number (1659336).

Almost surely, 2^18047913 is an apocalyptic number.

18047913 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18047913 is a deficient number, since it is larger than the sum of its proper divisors (8501463).

18047913 is a wasteful number, since it uses less digits than its factorization.

18047913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11344.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 18047913 is about 4248.2835357353. The cubic root of 18047913 is about 262.3064659645.

The spelling of 18047913 in words is "eighteen million, forty-seven thousand, nine hundred thirteen".