19870973 has 2 divisors, whose sum is σ = 19870974. Its totient is φ = 19870972.

The previous prime is 19870951. The next prime is 19870993. The reversal of 19870973 is 37907891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11002489 + 8868484 = 3317^2 + 2978^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19870973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19870913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9935486 + 9935487.

It is an arithmetic number, because the mean of its divisors is an integer number (9935487).

Almost surely, 2^19870973 is an apocalyptic number.

It is an amenable number.

19870973 is a deficient number, since it is larger than the sum of its proper divisors (1).

19870973 is an equidigital number, since it uses as much as digits as its factorization.

19870973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 19870973 is about 4457.6869562588. The cubic root of 19870973 is about 270.8567799399.

The spelling of 19870973 in words is "nineteen million, eight hundred seventy thousand, nine hundred seventy-three".