1213217964 has 36 divisors (see below), whose sum is σ = 3504852624. Its totient is φ = 346633632.

The previous prime is 1213217947. The next prime is 1213217983. The reversal of 1213217964 is 4697123121.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

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, 2406927 + ... + 2407430.

Almost surely, 2^1213217964 is an apocalyptic number.

1213217964 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1213217964 is an abundant number, since it is smaller than the sum of its proper divisors (2291634660).

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

1213217964 is a wasteful number, since it uses less digits than its factorization.

1213217964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4814374 (or 4814369 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 1213217964 is about 34831.2785295056. The cubic root of 1213217964 is about 1066.5460478627.

The spelling of 1213217964 in words is "one billion, two hundred thirteen million, two hundred seventeen thousand, nine hundred sixty-four".