13661973 has 16 divisors (see below), whose sum is σ = 21797440. Its totient is φ = 8407152.

The previous prime is 13661971. The next prime is 13662013. The reversal of 13661973 is 37916631.

13661973 is a `hidden beast` number, since 1 + 36 + 619 + 7 + 3 = 666.

13661973 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13661973 - 2¹ = 13661971 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 (13661971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19111 + ... + 19812.

It is an arithmetic number, because the mean of its divisors is an integer number (1362340).

Almost surely, 2^13661973 is an apocalyptic number.

13661973 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

13661973 is a deficient number, since it is larger than the sum of its proper divisors (8135467).

13661973 is a wasteful number, since it uses less digits than its factorization.

13661973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38945 (or 38939 counting only the distinct ones).

The product of its digits is 20412, while the sum is 36.

The square root of 13661973 is about 3696.2106271153. The cubic root of 13661973 is about 239.0586563780.

The spelling of 13661973 in words is "thirteen million, six hundred sixty-one thousand, nine hundred seventy-three".