1216895379 has 8 divisors (see below), whose sum is σ = 1854316800. Its totient is φ = 695368776.

The previous prime is 1216895371. The next prime is 1216895389. The reversal of 1216895379 is 9735986121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1216895379 - 2³ = 1216895371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216895371) 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, 28973679 + ... + 28973720.

It is an arithmetic number, because the mean of its divisors is an integer number (231789600).

Almost surely, 2^1216895379 is an apocalyptic number.

1216895379 is a deficient number, since it is larger than the sum of its proper divisors (637421421).

1216895379 is an equidigital number, since it uses as much as digits as its factorization.

1216895379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57947409.

The product of its digits is 816480, while the sum is 51.

The square root of 1216895379 is about 34884.0275627686. The cubic root of 1216895379 is about 1067.6225722758.

The spelling of 1216895379 in words is "one billion, two hundred sixteen million, eight hundred ninety-five thousand, three hundred seventy-nine".