15916449 has 4 divisors (see below), whose sum is σ = 21221936. Its totient is φ = 10610964.

The previous prime is 15916427. The next prime is 15916469. The reversal of 15916449 is 94461951.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94461951 = 3 ⋅31487317.

It is not a de Polignac number, because 15916449 - 2⁸ = 15916193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15916469) 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, 2652739 + ... + 2652744.

It is an arithmetic number, because the mean of its divisors is an integer number (5305484).

Almost surely, 2^15916449 is an apocalyptic number.

It is an amenable number.

15916449 is a deficient number, since it is larger than the sum of its proper divisors (5305487).

15916449 is an equidigital number, since it uses as much as digits as its factorization.

15916449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5305486.

The product of its digits is 38880, while the sum is 39.

The square root of 15916449 is about 3989.5424549690. The cubic root of 15916449 is about 251.5448290173.

The spelling of 15916449 in words is "fifteen million, nine hundred sixteen thousand, four hundred forty-nine".