13739720 has 32 divisors (see below), whose sum is σ = 31502520. Its totient is φ = 5391360.

The previous prime is 13739683. The next prime is 13739729. The reversal of 13739720 is 2793731.

It can be written as a sum of positive squares in 4 ways, for example, as 13675204 + 64516 = 3698^2 + 254^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13739729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1121 + ... + 5360.

Almost surely, 2^13739720 is an apocalyptic number.

13739720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13739720 is an abundant number, since it is smaller than the sum of its proper divisors (17762800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13739720 is a wasteful number, since it uses less digits than its factorization.

13739720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6545 (or 6541 counting only the distinct ones).

The product of its (nonzero) digits is 7938, while the sum is 32.

The square root of 13739720 is about 3706.7128294488. The cubic root of 13739720 is about 239.5112739727.

The spelling of 13739720 in words is "thirteen million, seven hundred thirty-nine thousand, seven hundred twenty".