1213779952 has 160 divisors (see below), whose sum is σ = 3082088448. Its totient is φ = 449280000.

The previous prime is 1213779947. The next prime is 1213779961. The reversal of 1213779952 is 2599773121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2329452 + ... + 2329972.

Almost surely, 2^1213779952 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213779952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1541044224).

1213779952 is an abundant number, since it is smaller than the sum of its proper divisors (1868308496).

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

1213779952 is a wasteful number, since it uses less digits than its factorization.

1213779952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639 (or 633 counting only the distinct ones).

The product of its digits is 238140, while the sum is 46.

The square root of 1213779952 is about 34839.3448847707. The cubic root of 1213779952 is about 1066.7107046055.

The spelling of 1213779952 in words is "one billion, two hundred thirteen million, seven hundred seventy-nine thousand, nine hundred fifty-two".