18239461 has 2 divisors, whose sum is σ = 18239462. Its totient is φ = 18239460.

The previous prime is 18239447. The next prime is 18239471. The reversal of 18239461 is 16493281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18232900 + 6561 = 4270^2 + 81^2 .

It is a cyclic number.

It is not a de Polignac number, because 18239461 - 2²³ = 9850853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18239401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9119730 + 9119731.

It is an arithmetic number, because the mean of its divisors is an integer number (9119731).

Almost surely, 2^18239461 is an apocalyptic number.

It is an amenable number.

18239461 is a deficient number, since it is larger than the sum of its proper divisors (1).

18239461 is an equidigital number, since it uses as much as digits as its factorization.

18239461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 34.

The square root of 18239461 is about 4270.7681978773. The cubic root of 18239461 is about 263.2311816930.

The spelling of 18239461 in words is "eighteen million, two hundred thirty-nine thousand, four hundred sixty-one".