1214521992 has 128 divisors (see below), whose sum is σ = 3545856000. Its totient is φ = 384436800.

The previous prime is 1214521961. The next prime is 1214521993. The reversal of 1214521992 is 2991254121.

1214521992 is a `hidden beast` number, since 12 + 1 + 452 + 199 + 2 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (1214521993) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 749359 + ... + 750977.

It is an arithmetic number, because the mean of its divisors is an integer number (27702000).

Almost surely, 2^1214521992 is an apocalyptic number.

1214521992 is a gapful number since it is divisible by the number (12) 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 1214521992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1772928000).

1214521992 is an abundant number, since it is smaller than the sum of its proper divisors (2331334008).

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

1214521992 is a wasteful number, since it uses less digits than its factorization.

1214521992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1808 (or 1798 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 1214521992 is about 34849.9927116205. The cubic root of 1214521992 is about 1066.9280369049.

The spelling of 1214521992 in words is "one billion, two hundred fourteen million, five hundred twenty-one thousand, nine hundred ninety-two".