23953409 has 4 divisors (see below), whose sum is σ = 24463104. Its totient is φ = 23443716.

The previous prime is 23953387. The next prime is 23953441. The reversal of 23953409 is 90435932.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23953409 - 2¹² = 23949313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23953499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254777 + ... + 254870.

It is an arithmetic number, because the mean of its divisors is an integer number (6115776).

It is a Proth number, since it is equal to 731 ⋅ 2¹⁵ + 1 and 731 < 2¹⁵.

Almost surely, 2^23953409 is an apocalyptic number.

It is an amenable number.

23953409 is a deficient number, since it is larger than the sum of its proper divisors (509695).

23953409 is an equidigital number, since it uses as much as digits as its factorization.

23953409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509694.

The product of its (nonzero) digits is 29160, while the sum is 35.

The square root of 23953409 is about 4894.2220015034. Note that the first 3 decimals coincide. The cubic root of 23953409 is about 288.2631380089.

The spelling of 23953409 in words is "twenty-three million, nine hundred fifty-three thousand, four hundred nine".