14978391 has 8 divisors (see below), whose sum is σ = 20055024. Its totient is φ = 9943680.

The previous prime is 14978357. The next prime is 14978393. The reversal of 14978391 is 19387941.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 14978391 - 2¹⁰ = 14977367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (14978393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9636 + ... + 11081.

It is an arithmetic number, because the mean of its divisors is an integer number (2506878).

Almost surely, 2^14978391 is an apocalyptic number.

14978391 is a deficient number, since it is larger than the sum of its proper divisors (5076633).

14978391 is a wasteful number, since it uses less digits than its factorization.

14978391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20961.

The product of its digits is 54432, while the sum is 42.

The square root of 14978391 is about 3870.1926308648. The cubic root of 14978391 is about 246.5027230148.

The spelling of 14978391 in words is "fourteen million, nine hundred seventy-eight thousand, three hundred ninety-one".