23151540 has 24 divisors (see below), whose sum is σ = 64824480. Its totient is φ = 6173728.

The previous prime is 23151539. The next prime is 23151559. The reversal of 23151540 is 4515132.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192870 + ... + 192989.

It is an arithmetic number, because the mean of its divisors is an integer number (2701020).

Almost surely, 2^23151540 is an apocalyptic number.

23151540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23151540 is an abundant number, since it is smaller than the sum of its proper divisors (41672940).

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

23151540 is a wasteful number, since it uses less digits than its factorization.

23151540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385871 (or 385869 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 23151540 is about 4811.6047219197. The cubic root of 23151540 is about 285.0099103971.

Adding to 23151540 its reverse (4515132), we get a palindrome (27666672).

The spelling of 23151540 in words is "twenty-three million, one hundred fifty-one thousand, five hundred forty".