13740821 has 8 divisors (see below), whose sum is σ = 14394240. Its totient is φ = 13092112.

The previous prime is 13740817. The next prime is 13740823. The reversal of 13740821 is 12804731.

13740821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13740821 - 2² = 13740817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13740823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5720 + ... + 7758.

It is an arithmetic number, because the mean of its divisors is an integer number (1799280).

Almost surely, 2^13740821 is an apocalyptic number.

It is an amenable number.

13740821 is a deficient number, since it is larger than the sum of its proper divisors (653419).

13740821 is a wasteful number, since it uses less digits than its factorization.

13740821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2355.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 13740821 is about 3706.8613408111. The cubic root of 13740821 is about 239.5176713585.

The spelling of 13740821 in words is "thirteen million, seven hundred forty thousand, eight hundred twenty-one".