23400405 has 24 divisors (see below), whose sum is σ = 46355712. Its totient is φ = 10697184.

The previous prime is 23400397. The next prime is 23400413. The reversal of 23400405 is 50400432.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (23400397) and next prime (23400413).

It is not a de Polignac number, because 23400405 - 2³ = 23400397 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36829 + ... + 37458.

It is an arithmetic number, because the mean of its divisors is an integer number (1931488).

Almost surely, 2^23400405 is an apocalyptic number.

It is an amenable number.

23400405 is a deficient number, since it is larger than the sum of its proper divisors (22955307).

23400405 is a wasteful number, since it uses less digits than its factorization.

23400405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74305 (or 74302 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 23400405 is about 4837.3965105209. The cubic root of 23400405 is about 286.0275007379.

Adding to 23400405 its reverse (50400432), we get a palindrome (73800837).

The spelling of 23400405 in words is "twenty-three million, four hundred thousand, four hundred five".