13899487 has 12 divisors (see below), whose sum is σ = 16231320. Its totient is φ = 11867856.

The previous prime is 13899481. The next prime is 13899491. The reversal of 13899487 is 78499831.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-13899487 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a self number, because there is not a number n which added to its sum of digits gives 13899487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13899481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20193 + ... + 20869.

It is an arithmetic number, because the mean of its divisors is an integer number (1352610).

Almost surely, 2^13899487 is an apocalyptic number.

13899487 is a deficient number, since it is larger than the sum of its proper divisors (2331833).

13899487 is an equidigital number, since it uses as much as digits as its factorization.

13899487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110 (or 1103 counting only the distinct ones).

The product of its digits is 435456, while the sum is 49.

The square root of 13899487 is about 3728.2015771683. The cubic root of 13899487 is about 240.4360533246.

The spelling of 13899487 in words is "thirteen million, eight hundred ninety-nine thousand, four hundred eighty-seven".