19776973 has 2 divisors, whose sum is σ = 19776974. Its totient is φ = 19776972.

The previous prime is 19776961. The next prime is 19777013. The reversal of 19776973 is 37967791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14002564 + 5774409 = 3742^2 + 2403^2 .

It is a cyclic number.

It is not a de Polignac number, because 19776973 - 2⁹ = 19776461 is a prime.

It is a super-2 number, since 2×19776973² = 782257322085458, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19779973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9888486 + 9888487.

It is an arithmetic number, because the mean of its divisors is an integer number (9888487).

Almost surely, 2^19776973 is an apocalyptic number.

It is an amenable number.

19776973 is a deficient number, since it is larger than the sum of its proper divisors (1).

19776973 is an equidigital number, since it uses as much as digits as its factorization.

19776973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 500094, while the sum is 49.

The square root of 19776973 is about 4447.1308728213. The cubic root of 19776973 is about 270.4290070550.

The spelling of 19776973 in words is "nineteen million, seven hundred seventy-six thousand, nine hundred seventy-three".