1215982893 has 4 divisors (see below), whose sum is σ = 1621310528. Its totient is φ = 810655260.

The previous prime is 1215982841. The next prime is 1215982897. The reversal of 1215982893 is 3982895121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1215982893 - 2⁶ = 1215982829 is a prime.

It is a super-2 number, since 2×1215982893² = 2957228792137298898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215982897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202663813 + ... + 202663818.

It is an arithmetic number, because the mean of its divisors is an integer number (405327632).

Almost surely, 2^1215982893 is an apocalyptic number.

It is an amenable number.

1215982893 is a deficient number, since it is larger than the sum of its proper divisors (405327635).

1215982893 is an equidigital number, since it uses as much as digits as its factorization.

1215982893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405327634.

The product of its digits is 311040, while the sum is 48.

The square root of 1215982893 is about 34870.9462590277. The cubic root of 1215982893 is about 1067.3556541641.

The spelling of 1215982893 in words is "one billion, two hundred fifteen million, nine hundred eighty-two thousand, eight hundred ninety-three".