1252635642 has 24 divisors (see below), whose sum is σ = 2715088116. Its totient is φ = 417384576.

The previous prime is 1252635619. The next prime is 1252635653. The reversal of 1252635642 is 2465362521.

1252635642 is a `hidden beast` number, since 1 + 2 + 5 + 2 + 6 + 3 + 5 + 642 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1241082441 + 11553201 = 35229^2 + 3399^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1252635597 and 1252635606.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40578 + ... + 64434.

Almost surely, 2^1252635642 is an apocalyptic number.

1252635642 is an abundant number, since it is smaller than the sum of its proper divisors (1462452474).

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

1252635642 is a wasteful number, since it uses less digits than its factorization.

1252635642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26782 (or 26779 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 1252635642 is about 35392.5930386571. The cubic root of 1252635642 is about 1077.9739226541.

The spelling of 1252635642 in words is "one billion, two hundred fifty-two million, six hundred thirty-five thousand, six hundred forty-two".