1253775638 has 4 divisors (see below), whose sum is σ = 1880663460. Its totient is φ = 626887818.

The previous prime is 1253775617. The next prime is 1253775683. The reversal of 1253775638 is 8365773521.

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

It is a junction number, because it is equal to n+sod(n) for n = 1253775592 and 1253775601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313443908 + ... + 313443911.

It is an arithmetic number, because the mean of its divisors is an integer number (470165865).

Almost surely, 2^1253775638 is an apocalyptic number.

1253775638 is a deficient number, since it is larger than the sum of its proper divisors (626887822).

1253775638 is an equidigital number, since it uses as much as digits as its factorization.

1253775638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626887821.

The product of its digits is 1058400, while the sum is 47.

The square root of 1253775638 is about 35408.6943842893. The cubic root of 1253775638 is about 1078.3008369121.

The spelling of 1253775638 in words is "one billion, two hundred fifty-three million, seven hundred seventy-five thousand, six hundred thirty-eight".