427921973 has 2 divisors, whose sum is σ = 427921974. Its totient is φ = 427921972.

The previous prime is 427921957. The next prime is 427921987. The reversal of 427921973 is 379129724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 368908849 + 59013124 = 19207^2 + 7682^2 .

It is a cyclic number.

It is not a de Polignac number, because 427921973 - 2⁴ = 427921957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (427921903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213960986 + 213960987.

It is an arithmetic number, because the mean of its divisors is an integer number (213960987).

Almost surely, 2^427921973 is an apocalyptic number.

It is an amenable number.

427921973 is a deficient number, since it is larger than the sum of its proper divisors (1).

427921973 is an equidigital number, since it uses as much as digits as its factorization.

427921973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 44.

The square root of 427921973 is about 20686.2749909209. The cubic root of 427921973 is about 753.5664055284.

The spelling of 427921973 in words is "four hundred twenty-seven million, nine hundred twenty-one thousand, nine hundred seventy-three".