14991869 has 6 divisors (see below), whose sum is σ = 15530430. Its totient is φ = 14454776.

The previous prime is 14991859. The next prime is 14991871. The reversal of 14991869 is 96819941.

It can be written as a sum of positive squares in only one way, i.e., 12924025 + 2067844 = 3595^2 + 1438^2 .

It is a de Polignac number, because none of the positive numbers 2^k-14991869 is a prime.

It is a super-2 number, since 2×14991869² = 449512272226322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (14991829) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20492 + ... + 21210.

It is an arithmetic number, because the mean of its divisors is an integer number (2588405).

Almost surely, 2^14991869 is an apocalyptic number.

It is an amenable number.

14991869 is a deficient number, since it is larger than the sum of its proper divisors (538561).

14991869 is an frugal number, since it uses more digits than its factorization.

14991869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1467 (or 748 counting only the distinct ones).

The product of its digits is 139968, while the sum is 47.

The square root of 14991869 is about 3871.9334963297. The cubic root of 14991869 is about 246.5766376669.

The spelling of 14991869 in words is "fourteen million, nine hundred ninety-one thousand, eight hundred sixty-nine".