1215885738 has 16 divisors (see below), whose sum is σ = 2432960640. Its totient is φ = 405097056.

The previous prime is 1215885719. The next prime is 1215885757. The reversal of 1215885738 is 8375885121.

It is an interprime number because it is at equal distance from previous prime (1215885719) and next prime (1215885757).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35970 + ... + 61037.

It is an arithmetic number, because the mean of its divisors is an integer number (152060040).

Almost surely, 2^1215885738 is an apocalyptic number.

1215885738 is an abundant number, since it is smaller than the sum of its proper divisors (1217074902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1215885738 is a wasteful number, since it uses less digits than its factorization.

1215885738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99101.

The product of its digits is 537600, while the sum is 48.

The square root of 1215885738 is about 34869.5531660502. The cubic root of 1215885738 is about 1067.3272267629.

The spelling of 1215885738 in words is "one billion, two hundred fifteen million, eight hundred eighty-five thousand, seven hundred thirty-eight".