1215385290 has 64 divisors (see below), whose sum is σ = 3704037120. Its totient is φ = 277801920.

The previous prime is 1215385277. The next prime is 1215385307. The reversal of 1215385290 is 925835121.

1215385290 is a `hidden beast` number, since 121 + 5 + 3 + 8 + 529 + 0 = 666.

It is a super-2 number, since 2×1215385290² = 2954322806296768200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 319641 + ... + 323420.

It is an arithmetic number, because the mean of its divisors is an integer number (57875580).

Almost surely, 2^1215385290 is an apocalyptic number.

1215385290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1215385290 is an abundant number, since it is smaller than the sum of its proper divisors (2488651830).

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

1215385290 is a wasteful number, since it uses less digits than its factorization.

1215385290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643084 (or 643078 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 1215385290 is about 34862.3764250230. The cubic root of 1215385290 is about 1067.1807724653.

The spelling of 1215385290 in words is "one billion, two hundred fifteen million, three hundred eighty-five thousand, two hundred ninety".