15213987 has 24 divisors (see below), whose sum is σ = 23006256. Its totient is φ = 10046592.

The previous prime is 15213973. The next prime is 15214013. The reversal of 15213987 is 78931251.

It is not a de Polignac number, because 15213987 - 2⁶ = 15213923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15213907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33063 + ... + 33519.

It is an arithmetic number, because the mean of its divisors is an integer number (958594).

Almost surely, 2^15213987 is an apocalyptic number.

15213987 is a deficient number, since it is larger than the sum of its proper divisors (7792269).

15213987 is an equidigital number, since it uses as much as digits as its factorization.

15213987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609 (or 597 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 15213987 is about 3900.5111203533. The cubic root of 15213987 is about 247.7884240851.

The spelling of 15213987 in words is "fifteen million, two hundred thirteen thousand, nine hundred eighty-seven".