1215748389 has 16 divisors (see below), whose sum is σ = 1659393792. Its totient is φ = 791382528.

The previous prime is 1215748363. The next prime is 1215748399. The reversal of 1215748389 is 9838475121.

It is not a de Polignac number, because 1215748389 - 2²¹ = 1213651237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215748309) 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, 51097 + ... + 71009.

It is an arithmetic number, because the mean of its divisors is an integer number (103712112).

Almost surely, 2^1215748389 is an apocalyptic number.

It is an amenable number.

1215748389 is a deficient number, since it is larger than the sum of its proper divisors (443645403).

1215748389 is a wasteful number, since it uses less digits than its factorization.

1215748389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20396.

The product of its digits is 483840, while the sum is 48.

The square root of 1215748389 is about 34867.5836415430. The cubic root of 1215748389 is about 1067.2870360764.

The spelling of 1215748389 in words is "one billion, two hundred fifteen million, seven hundred forty-eight thousand, three hundred eighty-nine".