1213635642 has 16 divisors (see below), whose sum is σ = 2429127360. Its totient is φ = 404235872.

The previous prime is 1213635637. The next prime is 1213635653. The reversal of 1213635642 is 2465363121.

It is a super-2 number, since 2×1213635642² = 2945822943065504328, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68763 + ... + 84590.

It is an arithmetic number, because the mean of its divisors is an integer number (151820460).

Almost surely, 2^1213635642 is an apocalyptic number.

1213635642 is an abundant number, since it is smaller than the sum of its proper divisors (1215491718).

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

1213635642 is a wasteful number, since it uses less digits than its factorization.

1213635642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154677.

The product of its digits is 25920, while the sum is 33.

The square root of 1213635642 is about 34837.2737452287. The cubic root of 1213635642 is about 1066.6684281004.

Adding to 1213635642 its reverse (2465363121), we get a palindrome (3678998763).

The spelling of 1213635642 in words is "one billion, two hundred thirteen million, six hundred thirty-five thousand, six hundred forty-two".