1222991964 has 36 divisors (see below), whose sum is σ = 3093393576. Its totient is φ = 407407968.

The previous prime is 1222991963. The next prime is 1222991983. The reversal of 1222991964 is 4691992221.

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

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222991963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52587 + ... + 72189.

Almost surely, 2^1222991964 is an apocalyptic number.

It is an amenable number.

1222991964 is an abundant number, since it is smaller than the sum of its proper divisors (1870401612).

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

1222991964 is a wasteful number, since it uses less digits than its factorization.

1222991964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21346 (or 21341 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 1222991964 is about 34971.3020060735. The cubic root of 1222991964 is about 1069.4025150030.

The spelling of 1222991964 in words is "one billion, two hundred twenty-two million, nine hundred ninety-one thousand, nine hundred sixty-four".