13949821 has 2 divisors, whose sum is σ = 13949822. Its totient is φ = 13949820.

The previous prime is 13949813. The next prime is 13949839. The reversal of 13949821 is 12894931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13793796 + 156025 = 3714^2 + 395^2 .

It is a cyclic number.

It is not a de Polignac number, because 13949821 - 2³ = 13949813 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13949521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6974910 + 6974911.

It is an arithmetic number, because the mean of its divisors is an integer number (6974911).

Almost surely, 2^13949821 is an apocalyptic number.

It is an amenable number.

13949821 is a deficient number, since it is larger than the sum of its proper divisors (1).

13949821 is an equidigital number, since it uses as much as digits as its factorization.

13949821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 13949821 is about 3734.9459166098. The cubic root of 13949821 is about 240.7259328296.

The spelling of 13949821 in words is "thirteen million, nine hundred forty-nine thousand, eight hundred twenty-one".