1252777538 has 8 divisors (see below), whose sum is σ = 1897772220. Its totient is φ = 620186800.

The previous prime is 1252777531. The next prime is 1252777553. The reversal of 1252777538 is 8357772521.

It can be written as a sum of positive squares in 2 ways, for example, as 1065826609 + 186950929 = 32647^2 + 13673^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1252777492 and 1252777501.

It is not an unprimeable number, because it can be changed into a prime (1252777531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3100733 + ... + 3101136.

Almost surely, 2^1252777538 is an apocalyptic number.

1252777538 is a deficient number, since it is larger than the sum of its proper divisors (644994682).

1252777538 is a wasteful number, since it uses less digits than its factorization.

1252777538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6201972.

The product of its digits is 823200, while the sum is 47.

The square root of 1252777538 is about 35394.5975821170. The cubic root of 1252777538 is about 1078.0146246767.

The spelling of 1252777538 in words is "one billion, two hundred fifty-two million, seven hundred seventy-seven thousand, five hundred thirty-eight".