15147987 has 4 divisors (see below), whose sum is σ = 20197320. Its totient is φ = 10098656.

The previous prime is 15147973. The next prime is 15148009. The reversal of 15147987 is 78974151.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78974151 = 3 ⋅26324717.

It is a cyclic number.

It is not a de Polignac number, because 15147987 - 2⁷ = 15147859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15147917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2524662 + ... + 2524667.

It is an arithmetic number, because the mean of its divisors is an integer number (5049330).

Almost surely, 2^15147987 is an apocalyptic number.

15147987 is a deficient number, since it is larger than the sum of its proper divisors (5049333).

15147987 is an equidigital number, since it uses as much as digits as its factorization.

15147987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5049332.

The product of its digits is 70560, while the sum is 42.

The square root of 15147987 is about 3892.0414951539. The cubic root of 15147987 is about 247.4295932780.

The spelling of 15147987 in words is "fifteen million, one hundred forty-seven thousand, nine hundred eighty-seven".