1212151920 has 160 divisors (see below), whose sum is σ = 4346721792. Its totient is φ = 273693696.

The previous prime is 1212151909. The next prime is 1212151937. The reversal of 1212151920 is 291512121.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 135094 + ... + 143786.

Almost surely, 2^1212151920 is an apocalyptic number.

1212151920 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 1212151920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2173360896).

1212151920 is an abundant number, since it is smaller than the sum of its proper divisors (3134569872).

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

1212151920 is a wasteful number, since it uses less digits than its factorization.

1212151920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8799 (or 8793 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 24.

The square root of 1212151920 is about 34815.9721966801. The cubic root of 1212151920 is about 1066.2335680964.

The spelling of 1212151920 in words is "one billion, two hundred twelve million, one hundred fifty-one thousand, nine hundred twenty".