14978809 has 4 divisors (see below), whose sum is σ = 15010560. Its totient is φ = 14947060.

The previous prime is 14978801. The next prime is 14978827. The reversal of 14978809 is 90887941.

It is a happy number.

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: 90887941 = 233 ⋅390077.

It is a cyclic number.

It is not a de Polignac number, because 14978809 - 2³ = 14978801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (14978801) 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, 15157 + ... + 16114.

It is an arithmetic number, because the mean of its divisors is an integer number (3752640).

Almost surely, 2^14978809 is an apocalyptic number.

It is an amenable number.

14978809 is a deficient number, since it is larger than the sum of its proper divisors (31751).

14978809 is an equidigital number, since it uses as much as digits as its factorization.

14978809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31750.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 14978809 is about 3870.2466329680. The cubic root of 14978809 is about 246.5050160332.

The spelling of 14978809 in words is "fourteen million, nine hundred seventy-eight thousand, eight hundred nine".