23142840 has 64 divisors (see below), whose sum is σ = 79349760. Its totient is φ = 5289600.

The previous prime is 23142839. The next prime is 23142859. The reversal of 23142840 is 4824132.

It is a super-4 number, since 4×23142840⁴ (a number of 31 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 23142840.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12936 + ... + 14615.

It is an arithmetic number, because the mean of its divisors is an integer number (1239840).

Almost surely, 2^23142840 is an apocalyptic number.

23142840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23142840 is an abundant number, since it is smaller than the sum of its proper divisors (56206920).

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

23142840 is a wasteful number, since it uses less digits than its factorization.

23142840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27572 (or 27568 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 23142840 is about 4810.7005726817. The cubic root of 23142840 is about 284.9742051139.

Adding to 23142840 its reverse (4824132), we get a palindrome (27966972).

It can be divided in two parts, 231 and 42840, that added together give a triangular number (43071 = T₂₉₃).

The spelling of 23142840 in words is "twenty-three million, one hundred forty-two thousand, eight hundred forty".