14991278 has 4 divisors (see below), whose sum is σ = 22486920. Its totient is φ = 7495638.

The previous prime is 14991271. The next prime is 14991287. The reversal of 14991278 is 87219941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87219941 = 677 ⋅128833.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (14991271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3747818 + ... + 3747821.

It is an arithmetic number, because the mean of its divisors is an integer number (5621730).

Almost surely, 2^14991278 is an apocalyptic number.

14991278 is a deficient number, since it is larger than the sum of its proper divisors (7495642).

14991278 is an equidigital number, since it uses as much as digits as its factorization.

14991278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7495641.

The product of its digits is 36288, while the sum is 41.

The square root of 14991278 is about 3871.8571771180. The cubic root of 14991278 is about 246.5733974947.

The spelling of 14991278 in words is "fourteen million, nine hundred ninety-one thousand, two hundred seventy-eight".