1215898993 has 8 divisors (see below), whose sum is σ = 1248823296. Its totient is φ = 1183130400.

The previous prime is 1215898991. The next prime is 1215899011. The reversal of 1215898993 is 3998985121.

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

It is a cyclic number.

It is not a de Polignac number, because 1215898993 - 2¹ = 1215898991 is a prime.

It is a super-2 number, since 2×1215898993² = 2956820722356828098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215898991) 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, 23013 + ... + 54418.

It is an arithmetic number, because the mean of its divisors is an integer number (156102912).

Almost surely, 2^1215898993 is an apocalyptic number.

It is an amenable number.

1215898993 is a deficient number, since it is larger than the sum of its proper divisors (32924303).

1215898993 is an equidigital number, since it uses as much as digits as its factorization.

1215898993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77855.

The product of its digits is 1399680, while the sum is 55.

The square root of 1215898993 is about 34869.7432310592. The cubic root of 1215898993 is about 1067.3311052444.

The spelling of 1215898993 in words is "one billion, two hundred fifteen million, eight hundred ninety-eight thousand, nine hundred ninety-three".