253439945 has 12 divisors (see below), whose sum is σ = 334290180. Its totient is φ = 184319520.

The previous prime is 253439941. The next prime is 253439947. The reversal of 253439945 is 549934352.

It can be written as a sum of positive squares in 2 ways, for example, as 107827456 + 145612489 = 10384^2 + 12067^2 .

It is not a de Polignac number, because 253439945 - 2² = 253439941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 253439896 and 253439905.

It is not an unprimeable number, because it can be changed into a prime (253439941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 208850 + ... + 210059.

It is an arithmetic number, because the mean of its divisors is an integer number (27857515).

Almost surely, 2^253439945 is an apocalyptic number.

It is an amenable number.

253439945 is a deficient number, since it is larger than the sum of its proper divisors (80850235).

253439945 is a wasteful number, since it uses less digits than its factorization.

253439945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418936 (or 418925 counting only the distinct ones).

The product of its digits is 583200, while the sum is 44.

The square root of 253439945 is about 15919.7972662971. The cubic root of 253439945 is about 632.8367456991.

The spelling of 253439945 in words is "two hundred fifty-three million, four hundred thirty-nine thousand, nine hundred forty-five".