1216882379 has 4 divisors (see below), whose sum is σ = 1280928840. Its totient is φ = 1152835920.

The previous prime is 1216882357. The next prime is 1216882391. The reversal of 1216882379 is 9732886121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1216882379 - 2¹² = 1216878283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216882309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32023202 + ... + 32023239.

It is an arithmetic number, because the mean of its divisors is an integer number (320232210).

Almost surely, 2^1216882379 is an apocalyptic number.

1216882379 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1216882379 is a deficient number, since it is larger than the sum of its proper divisors (64046461).

1216882379 is an equidigital number, since it uses as much as digits as its factorization.

1216882379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64046460.

The product of its digits is 290304, while the sum is 47.

The square root of 1216882379 is about 34883.8412305755. The cubic root of 1216882379 is about 1067.6187704856.

The spelling of 1216882379 in words is "one billion, two hundred sixteen million, eight hundred eighty-two thousand, three hundred seventy-nine".