1213332920 has 32 divisors (see below), whose sum is σ = 2755522800. Its totient is φ = 480795648.

The previous prime is 1213332899. The next prime is 1213332929. The reversal of 1213332920 is 292333121.

It is a self number, because there is not a number n which added to its sum of digits gives 1213332920.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213332929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137465 + ... + 146024.

Almost surely, 2^1213332920 is an apocalyptic number.

1213332920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213332920 is an abundant number, since it is smaller than the sum of its proper divisors (1542189880).

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

1213332920 is a wasteful number, since it uses less digits than its factorization.

1213332920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283607 (or 283603 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 1213332920 is about 34832.9286738856. The cubic root of 1213332920 is about 1066.5797329324.

The spelling of 1213332920 in words is "one billion, two hundred thirteen million, three hundred thirty-two thousand, nine hundred twenty".