427808999 has 2 divisors, whose sum is σ = 427809000. Its totient is φ = 427808998.

The previous prime is 427808989. The next prime is 427809023. The reversal of 427808999 is 999808724.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-427808999 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (427808929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213904499 + 213904500.

It is an arithmetic number, because the mean of its divisors is an integer number (213904500).

Almost surely, 2^427808999 is an apocalyptic number.

427808999 is a deficient number, since it is larger than the sum of its proper divisors (1).

427808999 is an equidigital number, since it uses as much as digits as its factorization.

427808999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 56.

The square root of 427808999 is about 20683.5441595487. The cubic root of 427808999 is about 753.5000843223.

The spelling of 427808999 in words is "four hundred twenty-seven million, eight hundred eight thousand, nine hundred ninety-nine".