1221692088 has 32 divisors (see below), whose sum is σ = 3128726160. Its totient is φ = 397297920.

The previous prime is 1221692083. The next prime is 1221692089. The reversal of 1221692088 is 8802961221.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221692083) 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 7 ways as a sum of consecutive naturals, for example, 619795 + ... + 621762.

Almost surely, 2^1221692088 is an apocalyptic number.

It is an amenable number.

1221692088 is an abundant number, since it is smaller than the sum of its proper divisors (1907034072).

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

1221692088 is a wasteful number, since it uses less digits than its factorization.

1221692088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241607 (or 1241603 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 1221692088 is about 34952.7121694440. The cubic root of 1221692088 is about 1069.0235036689.

The spelling of 1221692088 in words is "one billion, two hundred twenty-one million, six hundred ninety-two thousand, eighty-eight".