23155438 has 4 divisors (see below), whose sum is σ = 34733160. Its totient is φ = 11577718.

The previous prime is 23155373. The next prime is 23155463. The reversal of 23155438 is 83455132.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5788858 + ... + 5788861.

It is an arithmetic number, because the mean of its divisors is an integer number (8683290).

Almost surely, 2^23155438 is an apocalyptic number.

23155438 is a deficient number, since it is larger than the sum of its proper divisors (11577722).

23155438 is a wasteful number, since it uses less digits than its factorization.

23155438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11577721.

The product of its digits is 14400, while the sum is 31.

The square root of 23155438 is about 4812.0097672386. The cubic root of 23155438 is about 285.0259051040.

The spelling of 23155438 in words is "twenty-three million, one hundred fifty-five thousand, four hundred thirty-eight".