252640123 has 4 divisors (see below), whose sum is σ = 252884320. Its totient is φ = 252395928.

The previous prime is 252640121. The next prime is 252640159. The reversal of 252640123 is 321046252.

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

It is a cyclic number.

It is not a de Polignac number, because 252640123 - 2¹ = 252640121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (252640121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120540 + ... + 122617.

It is an arithmetic number, because the mean of its divisors is an integer number (63221080).

Almost surely, 2^252640123 is an apocalyptic number.

252640123 is a deficient number, since it is larger than the sum of its proper divisors (244197).

252640123 is a wasteful number, since it uses less digits than its factorization.

252640123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244196.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 252640123 is about 15894.6570582696. The cubic root of 252640123 is about 632.1703285970.

Adding to 252640123 its reverse (321046252), we get a palindrome (573686375).

The spelling of 252640123 in words is "two hundred fifty-two million, six hundred forty thousand, one hundred twenty-three".