13991737 has 4 divisors (see below), whose sum is σ = 14050036. Its totient is φ = 13933440.

The previous prime is 13991711. The next prime is 13991741. The reversal of 13991737 is 73719931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73719931 = 43 ⋅1714417.

It can be written as a sum of positive squares in 2 ways, for example, as 8590761 + 5400976 = 2931^2 + 2324^2 .

It is a cyclic number.

It is not a de Polignac number, because 13991737 - 2¹⁵ = 13958969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13991737.

It is not an unprimeable number, because it can be changed into a prime (13991767) 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, 28788 + ... + 29269.

It is an arithmetic number, because the mean of its divisors is an integer number (3512509).

Almost surely, 2^13991737 is an apocalyptic number.

It is an amenable number.

13991737 is a deficient number, since it is larger than the sum of its proper divisors (58299).

13991737 is an equidigital number, since it uses as much as digits as its factorization.

13991737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58298.

The product of its digits is 35721, while the sum is 40.

The square root of 13991737 is about 3740.5530339777. The cubic root of 13991737 is about 240.9668004060.

It can be divided in two parts, 1399 and 1737, that added together give a square (3136 = 56²).

The spelling of 13991737 in words is "thirteen million, nine hundred ninety-one thousand, seven hundred thirty-seven".