18923407 has 2 divisors, whose sum is σ = 18923408. Its totient is φ = 18923406.

The previous prime is 18923389. The next prime is 18923441. The reversal of 18923407 is 70432981.

It is an a-pointer prime, because the next prime (18923441) can be obtained adding 18923407 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18923407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18923477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9461703 + 9461704.

It is an arithmetic number, because the mean of its divisors is an integer number (9461704).

Almost surely, 2^18923407 is an apocalyptic number.

18923407 is a deficient number, since it is larger than the sum of its proper divisors (1).

18923407 is an equidigital number, since it uses as much as digits as its factorization.

18923407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 18923407 is about 4350.1042516243. The cubic root of 18923407 is about 266.4811190155.

The spelling of 18923407 in words is "eighteen million, nine hundred twenty-three thousand, four hundred seven".