423999973 has 2 divisors, whose sum is σ = 423999974. Its totient is φ = 423999972.

The previous prime is 423999967. The next prime is 424000013. The reversal of 423999973 is 379999324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 278990209 + 145009764 = 16703^2 + 12042^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423999973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423999943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211999986 + 211999987.

It is an arithmetic number, because the mean of its divisors is an integer number (211999987).

Almost surely, 2^423999973 is an apocalyptic number.

It is an amenable number.

423999973 is a deficient number, since it is larger than the sum of its proper divisors (1).

423999973 is an equidigital number, since it uses as much as digits as its factorization.

423999973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3306744, while the sum is 55.

The square root of 423999973 is about 20591.2596263560. The cubic root of 423999973 is about 751.2571348977.

The spelling of 423999973 in words is "four hundred twenty-three million, nine hundred ninety-nine thousand, nine hundred seventy-three".