253004240 has 40 divisors (see below), whose sum is σ = 596533248. Its totient is φ = 99774080.

The previous prime is 253004239. The next prime is 253004263. The reversal of 253004240 is 42400352.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×253004240² = 128022290915955200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16592 + ... + 27951.

Almost surely, 2^253004240 is an apocalyptic number.

253004240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

253004240 is an abundant number, since it is smaller than the sum of its proper divisors (343529008).

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

253004240 is a wasteful number, since it uses less digits than its factorization.

253004240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44627 (or 44621 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 253004240 is about 15906.1070032865. The cubic root of 253004240 is about 632.4738874897.

Adding to 253004240 its reverse (42400352), we get a palindrome (295404592).

The spelling of 253004240 in words is "two hundred fifty-three million, four thousand, two hundred forty".