23509404 has 36 divisors (see below), whose sum is σ = 62012496. Its totient is φ = 7495488.

The previous prime is 23509399. The next prime is 23509411. The reversal of 23509404 is 40490532.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13369 + ... + 15024.

Almost surely, 2^23509404 is an apocalyptic number.

It is an amenable number.

23509404 is an abundant number, since it is smaller than the sum of its proper divisors (38503092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23509404 is a wasteful number, since it uses less digits than its factorization.

23509404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28426 (or 28421 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 23509404 is about 4848.6497089396. The cubic root of 23509404 is about 286.4709179841.

Adding to 23509404 its reverse (40490532), we get a palindrome (63999936).

The spelling of 23509404 in words is "twenty-three million, five hundred nine thousand, four hundred four".