18456139 has 8 divisors (see below), whose sum is σ = 19982592. Its totient is φ = 16944960.

The previous prime is 18456121. The next prime is 18456157. The reversal of 18456139 is 93165481.

It is an interprime number because it is at equal distance from previous prime (18456121) and next prime (18456157).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18456139 - 2⁵ = 18456107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18456098 and 18456107.

It is not an unprimeable number, because it can be changed into a prime (18457139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1234 + ... + 6199.

It is an arithmetic number, because the mean of its divisors is an integer number (2497824).

Almost surely, 2^18456139 is an apocalyptic number.

18456139 is a deficient number, since it is larger than the sum of its proper divisors (1526453).

18456139 is a wasteful number, since it uses less digits than its factorization.

18456139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7637.

The product of its digits is 25920, while the sum is 37.

The square root of 18456139 is about 4296.0608701460. The cubic root of 18456139 is about 264.2694438764.

The spelling of 18456139 in words is "eighteen million, four hundred fifty-six thousand, one hundred thirty-nine".