1216955395 has 16 divisors (see below), whose sum is σ = 1470538080. Its totient is φ = 966795264.

The previous prime is 1216955393. The next prime is 1216955401. The reversal of 1216955395 is 5935596121.

It is a cyclic number.

It is not a de Polignac number, because 1216955395 - 2¹ = 1216955393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216955393) 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, 478036 + ... + 480574.

It is an arithmetic number, because the mean of its divisors is an integer number (91908630).

Almost surely, 2^1216955395 is an apocalyptic number.

1216955395 is a deficient number, since it is larger than the sum of its proper divisors (253582685).

1216955395 is a wasteful number, since it uses less digits than its factorization.

1216955395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3174.

The product of its digits is 364500, while the sum is 46.

The square root of 1216955395 is about 34884.8877739344. The cubic root of 1216955395 is about 1067.6401233280.

The spelling of 1216955395 in words is "one billion, two hundred sixteen million, nine hundred fifty-five thousand, three hundred ninety-five".