23145140 has 12 divisors (see below), whose sum is σ = 48604836. Its totient is φ = 9258048.

The previous prime is 23145119. The next prime is 23145167. The reversal of 23145140 is 4154132.

It can be written as a sum of positive squares in 2 ways, for example, as 3467044 + 19678096 = 1862^2 + 4436^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1157257 = 23145140 / (2 + 3 + 1 + 4 + 5 + 1 + 4 + 0).

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 3 ways as a sum of consecutive naturals, for example, 578609 + ... + 578648.

It is an arithmetic number, because the mean of its divisors is an integer number (4050403).

Almost surely, 2^23145140 is an apocalyptic number.

23145140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23145140 is an abundant number, since it is smaller than the sum of its proper divisors (25459696).

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

23145140 is a wasteful number, since it uses less digits than its factorization.

23145140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157266 (or 1157264 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 23145140 is about 4810.9396171642. The cubic root of 23145140 is about 284.9836453116.

Adding to 23145140 its reverse (4154132), we get a palindrome (27299272).

The spelling of 23145140 in words is "twenty-three million, one hundred forty-five thousand, one hundred forty".