19973953 has 4 divisors (see below), whose sum is σ = 20662740. Its totient is φ = 19285168.

The previous prime is 19973939. The next prime is 19973971. The reversal of 19973953 is 35937991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4787344 + 15186609 = 2188^2 + 3897^2 .

It is a cyclic number.

It is not a de Polignac number, because 19973953 - 2¹³ = 19965761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19973903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344350 + ... + 344407.

It is an arithmetic number, because the mean of its divisors is an integer number (5165685).

Almost surely, 2^19973953 is an apocalyptic number.

It is an amenable number.

19973953 is a deficient number, since it is larger than the sum of its proper divisors (688787).

19973953 is an equidigital number, since it uses as much as digits as its factorization.

19973953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688786.

The product of its digits is 229635, while the sum is 46.

The square root of 19973953 is about 4469.2228630938. Note that the first 3 decimals coincide. The cubic root of 19973953 is about 271.3238730745.

The spelling of 19973953 in words is "nineteen million, nine hundred seventy-three thousand, nine hundred fifty-three".