23278999 has 2 divisors, whose sum is σ = 23279000. Its totient is φ = 23278998.

The previous prime is 23278993. The next prime is 23279033. The reversal of 23278999 is 99987232.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23278999 - 2⁹ = 23278487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23278993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11639499 + 11639500.

It is an arithmetic number, because the mean of its divisors is an integer number (11639500).

Almost surely, 2^23278999 is an apocalyptic number.

23278999 is a deficient number, since it is larger than the sum of its proper divisors (1).

23278999 is an equidigital number, since it uses as much as digits as its factorization.

23278999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 49.

The square root of 23278999 is about 4824.8314996485. The cubic root of 23278999 is about 285.5319867691.

The spelling of 23278999 in words is "twenty-three million, two hundred seventy-eight thousand, nine hundred ninety-nine".