23140440 has 48 divisors (see below), whose sum is σ = 75207600. Its totient is φ = 6170688.

The previous prime is 23140433. The next prime is 23140501. The reversal of 23140440 is 4404132.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 31780 + ... + 32499.

It is an arithmetic number, because the mean of its divisors is an integer number (1566825).

Almost surely, 2^23140440 is an apocalyptic number.

23140440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23140440 is an abundant number, since it is smaller than the sum of its proper divisors (52067160).

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

23140440 is a wasteful number, since it uses less digits than its factorization.

23140440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64296 (or 64289 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 23140440 is about 4810.4511222961. The cubic root of 23140440 is about 284.9643538058.

Adding to 23140440 its reverse (4404132), we get a palindrome (27544572).

The spelling of 23140440 in words is "twenty-three million, one hundred forty thousand, four hundred forty".