1212169920 has 448 divisors, whose sum is σ = 4473391104. Its totient is φ = 275742720.

The previous prime is 1212169883. The next prime is 1212170017. The reversal of 1212169920 is 299612121.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11768589 + ... + 11768691.

It is an arithmetic number, because the mean of its divisors is an integer number (9985248).

Almost surely, 2^1212169920 is an apocalyptic number.

1212169920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212169920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2236695552).

1212169920 is an abundant number, since it is smaller than the sum of its proper divisors (3261221184).

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

1212169920 is a wasteful number, since it uses less digits than its factorization.

1212169920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 1212169920 is about 34816.2306977651. The cubic root of 1212169920 is about 1066.2388457928.

The spelling of 1212169920 in words is "one billion, two hundred twelve million, one hundred sixty-nine thousand, nine hundred twenty".