23519997 has 16 divisors (see below), whose sum is σ = 34968960. Its totient is φ = 15624000.

The previous prime is 23519987. The next prime is 23520017. The reversal of 23519997 is 79991532.

It is a happy number.

It is not a de Polignac number, because 23519997 - 2¹⁵ = 23487229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23519927) 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, 6997 + ... + 9797.

It is an arithmetic number, because the mean of its divisors is an integer number (2185560).

Almost surely, 2^23519997 is an apocalyptic number.

23519997 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

23519997 is a deficient number, since it is larger than the sum of its proper divisors (11448963).

23519997 is a wasteful number, since it uses less digits than its factorization.

23519997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3121 (or 3115 counting only the distinct ones).

The product of its digits is 153090, while the sum is 45.

The square root of 23519997 is about 4849.7419518981. The cubic root of 23519997 is about 286.5139380846.

The spelling of 23519997 in words is "twenty-three million, five hundred nineteen thousand, nine hundred ninety-seven".