1215981795 has 24 divisors (see below), whose sum is σ = 2263216464. Its totient is φ = 555877056.

The previous prime is 1215981787. The next prime is 1215981839. The reversal of 1215981795 is 5971895121.

It is not a de Polignac number, because 1215981795 - 2³ = 1215981787 is a prime.

It is a super-2 number, since 2×1215981795² = 2957223451542844050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 826464 + ... + 827933.

It is an arithmetic number, because the mean of its divisors is an integer number (94300686).

Almost surely, 2^1215981795 is an apocalyptic number.

1215981795 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1215981795 is a deficient number, since it is larger than the sum of its proper divisors (1047234669).

1215981795 is a wasteful number, since it uses less digits than its factorization.

1215981795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1654419 (or 1654412 counting only the distinct ones).

The product of its digits is 226800, while the sum is 48.

The square root of 1215981795 is about 34870.9305152587. The cubic root of 1215981795 is about 1067.3553328995.

The spelling of 1215981795 in words is "one billion, two hundred fifteen million, nine hundred eighty-one thousand, seven hundred ninety-five".