252940440 has 32 divisors (see below), whose sum is σ = 758821680. Its totient is φ = 67450752.

The previous prime is 252940423. The next prime is 252940447. The reversal of 252940440 is 44049252.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 252940398 and 252940407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252940447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1053799 + ... + 1054038.

Almost surely, 2^252940440 is an apocalyptic number.

252940440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

252940440 is an abundant number, since it is smaller than the sum of its proper divisors (505881240).

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

252940440 is a wasteful number, since it uses less digits than its factorization.

252940440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2107851 (or 2107847 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 252940440 is about 15904.1013578259. The cubic root of 252940440 is about 632.4207194396.

252940440 divided by its sum of digits (30) gives a palindrome (8431348).

Adding to 252940440 its reverse (44049252), we get a palindrome (296989692).

The spelling of 252940440 in words is "two hundred fifty-two million, nine hundred forty thousand, four hundred forty".