15990459 has 4 divisors (see below), whose sum is σ = 21320616. Its totient is φ = 10660304.

The previous prime is 15990437. The next prime is 15990473. The reversal of 15990459 is 95409951.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 15990459 - 2⁵ = 15990427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15990459.

It is not an unprimeable number, because it can be changed into a prime (15990059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2665074 + ... + 2665079.

It is an arithmetic number, because the mean of its divisors is an integer number (5330154).

Almost surely, 2^15990459 is an apocalyptic number.

15990459 is a deficient number, since it is larger than the sum of its proper divisors (5330157).

15990459 is an equidigital number, since it uses as much as digits as its factorization.

15990459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5330156.

The product of its (nonzero) digits is 72900, while the sum is 42.

The square root of 15990459 is about 3998.8071971527. The cubic root of 15990459 is about 251.9341129084.

The spelling of 15990459 in words is "fifteen million, nine hundred ninety thousand, four hundred fifty-nine".