1215219830 has 16 divisors (see below), whose sum is σ = 2386250064. Its totient is φ = 441898080.

The previous prime is 1215219821. The next prime is 1215219833. The reversal of 1215219830 is 389125121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215219833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5523617 + ... + 5523836.

It is an arithmetic number, because the mean of its divisors is an integer number (149140629).

Almost surely, 2^1215219830 is an apocalyptic number.

1215219830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1215219830 is a deficient number, since it is larger than the sum of its proper divisors (1171030234).

1215219830 is a wasteful number, since it uses less digits than its factorization.

1215219830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11047471.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 1215219830 is about 34860.0032989098. The cubic root of 1215219830 is about 1067.1323423514.

The spelling of 1215219830 in words is "one billion, two hundred fifteen million, two hundred nineteen thousand, eight hundred thirty".