19900973 has 2 divisors, whose sum is σ = 19900974. Its totient is φ = 19900972.

The previous prime is 19900967. The next prime is 19900981. The reversal of 19900973 is 37900991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16467364 + 3433609 = 4058^2 + 1853^2 .

It is a cyclic number.

It is not a de Polignac number, because 19900973 - 2⁸ = 19900717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19903973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9950486 + 9950487.

It is an arithmetic number, because the mean of its divisors is an integer number (9950487).

Almost surely, 2^19900973 is an apocalyptic number.

It is an amenable number.

19900973 is a deficient number, since it is larger than the sum of its proper divisors (1).

19900973 is an equidigital number, since it uses as much as digits as its factorization.

19900973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15309, while the sum is 38.

The square root of 19900973 is about 4461.0506609990. The cubic root of 19900973 is about 270.9930191600.

The spelling of 19900973 in words is "nineteen million, nine hundred thousand, nine hundred seventy-three".