1213894120 has 16 divisors (see below), whose sum is σ = 2731261860. Its totient is φ = 485557632.

The previous prime is 1213894091. The next prime is 1213894189. The reversal of 1213894120 is 214983121.

It can be written as a sum of positive squares in 2 ways, for example, as 1209509284 + 4384836 = 34778^2 + 2094^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15173637 + ... + 15173716.

Almost surely, 2^1213894120 is an apocalyptic number.

1213894120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213894120 is an abundant number, since it is smaller than the sum of its proper divisors (1517367740).

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

1213894120 is a wasteful number, since it uses less digits than its factorization.

1213894120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30347364 (or 30347360 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 1213894120 is about 34840.9833385913. The cubic root of 1213894120 is about 1066.7441484515.

The spelling of 1213894120 in words is "one billion, two hundred thirteen million, eight hundred ninety-four thousand, one hundred twenty".