253791945 has 24 divisors (see below), whose sum is σ = 479898432. Its totient is φ = 123050400.

The previous prime is 253791943. The next prime is 253791973. The reversal of 253791945 is 549197352.

It is a happy number.

It is not a de Polignac number, because 253791945 - 2¹ = 253791943 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 253791945.

It is not an unprimeable number, because it can be changed into a prime (253791943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 255861 + ... + 256850.

It is an arithmetic number, because the mean of its divisors is an integer number (19995768).

Almost surely, 2^253791945 is an apocalyptic number.

It is an amenable number.

253791945 is a deficient number, since it is larger than the sum of its proper divisors (226106487).

253791945 is a wasteful number, since it uses less digits than its factorization.

253791945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512733 (or 512730 counting only the distinct ones).

The product of its digits is 340200, while the sum is 45.

The square root of 253791945 is about 15930.8488474406. The cubic root of 253791945 is about 633.1295902032.

The spelling of 253791945 in words is "two hundred fifty-three million, seven hundred ninety-one thousand, nine hundred forty-five".