1216339949 has 16 divisors (see below), whose sum is σ = 1344237120. Its totient is φ = 1091376000.

The previous prime is 1216339921. The next prime is 1216339951. The reversal of 1216339949 is 9499336121.

It is a happy number.

It is not a de Polignac number, because 1216339949 - 2²⁴ = 1199562733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216339849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1038134 + ... + 1039304.

It is an arithmetic number, because the mean of its divisors is an integer number (84014820).

Almost surely, 2^1216339949 is an apocalyptic number.

It is an amenable number.

1216339949 is a deficient number, since it is larger than the sum of its proper divisors (127897171).

1216339949 is a wasteful number, since it uses less digits than its factorization.

1216339949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2332.

The product of its digits is 314928, while the sum is 47.

The square root of 1216339949 is about 34876.0655607825. The cubic root of 1216339949 is about 1067.4601151853.

The spelling of 1216339949 in words is "one billion, two hundred sixteen million, three hundred thirty-nine thousand, nine hundred forty-nine".