1213929808 has 80 divisors (see below), whose sum is σ = 2949561216. Its totient is φ = 471144960.

The previous prime is 1213929757. The next prime is 1213929859. The reversal of 1213929808 is 8089293121.

It is an interprime number because it is at equal distance from previous prime (1213929757) and next prime (1213929859).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69303 + ... + 85033.

Almost surely, 2^1213929808 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 1213929808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1474780608).

1213929808 is an abundant number, since it is smaller than the sum of its proper divisors (1735631408).

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

1213929808 is a wasteful number, since it uses less digits than its factorization.

1213929808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15812 (or 15806 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 1213929808 is about 34841.4954902915. The cubic root of 1213929808 is about 1066.7546022990.

The spelling of 1213929808 in words is "one billion, two hundred thirteen million, nine hundred twenty-nine thousand, eight hundred eight".