1521390867 has 16 divisors (see below), whose sum is σ = 2117955840. Its totient is φ = 969594912.

The previous prime is 1521390863. The next prime is 1521390907. The reversal of 1521390867 is 7680931251.

It is not a de Polignac number, because 1521390867 - 2² = 1521390863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1521390863) 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, 134568 + ... + 145434.

It is an arithmetic number, because the mean of its divisors is an integer number (132372240).

Almost surely, 2^1521390867 is an apocalyptic number.

1521390867 is a deficient number, since it is larger than the sum of its proper divisors (596564973).

1521390867 is a wasteful number, since it uses less digits than its factorization.

1521390867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12922.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 1521390867 is about 39005.0107934865. The cubic root of 1521390867 is about 1150.1300084903.

The spelling of 1521390867 in words is "one billion, five hundred twenty-one million, three hundred ninety thousand, eight hundred sixty-seven".