13780737 has 12 divisors (see below), whose sum is σ = 19948500. Its totient is φ = 9167328.

The previous prime is 13780733. The next prime is 13780747. The reversal of 13780737 is 73708731.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1418481 + 12362256 = 1191^2 + 3516^2 .

It is not a de Polignac number, because 13780737 - 2² = 13780733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13780733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3639 + ... + 6387.

It is an arithmetic number, because the mean of its divisors is an integer number (1662375).

Almost surely, 2^13780737 is an apocalyptic number.

It is an amenable number.

13780737 is a deficient number, since it is larger than the sum of its proper divisors (6167763).

13780737 is a wasteful number, since it uses less digits than its factorization.

13780737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3312 (or 3309 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 13780737 is about 3712.2415061523. The cubic root of 13780737 is about 239.7493737849.

The spelling of 13780737 in words is "thirteen million, seven hundred eighty thousand, seven hundred thirty-seven".