1215266487 has 8 divisors (see below), whose sum is σ = 1620517104. Its totient is φ = 810096768.

The previous prime is 1215266477. The next prime is 1215266491. The reversal of 1215266487 is 7846625121.

It is a happy number.

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

It is not a de Polignac number, because 1215266487 - 2²² = 1211072183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215266407) 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, 43663 + ... + 65855.

It is an arithmetic number, because the mean of its divisors is an integer number (202564638).

Almost surely, 2^1215266487 is an apocalyptic number.

1215266487 is a deficient number, since it is larger than the sum of its proper divisors (405250617).

1215266487 is a wasteful number, since it uses less digits than its factorization.

1215266487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40449.

The product of its digits is 161280, while the sum is 42.

The square root of 1215266487 is about 34860.6724978162. The cubic root of 1215266487 is about 1067.1459992923.

The spelling of 1215266487 in words is "one billion, two hundred fifteen million, two hundred sixty-six thousand, four hundred eighty-seven".