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14999999 = 72142857

14999999 has 4 divisors (see below), whose sum is σ = 17142864. Its totient is φ = 12857136.

The previous prime is 14999981. The next prime is 15000017. The reversal of 14999999 is 99999941.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (14999981) and next prime (15000017).

It is a cyclic number.

It is not a de Polignac number, because 14999999 - 220 = 13951423 is a prime.

It is a fibodiv number, since the Fibonacci-like sequence with seeds 1 and 4999999 contains 14999999 itself.

It is a Duffinian number.

14999999 is a modest number, since divided by 9999 gives 1499 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (14999969) 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, 1071422 + ... + 1071435.

It is an arithmetic number, because the mean of its divisors is an integer number (4285716).

Almost surely, 214999999 is an apocalyptic number.

14999999 is a deficient number, since it is larger than the sum of its proper divisors (2142865).

14999999 is an equidigital number, since it uses as much as digits as its factorization.

14999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2142864.

The product of its digits is 2125764, while the sum is 59.

The square root of 14999999 is about 3872.9832171080. The cubic root of 14999999 is about 246.6212019526.

It can be divided in two parts, 14 and 999999, that multiplied together give a triangular number (13999986 = T5291).

The spelling of 14999999 in words is "fourteen million, nine hundred ninety-nine thousand, nine hundred ninety-nine".

Divisors: 1 7 2142857 14999999