427391999 has 2 divisors, whose sum is σ = 427392000. Its totient is φ = 427391998.

The previous prime is 427391981. The next prime is 427392029. The reversal of 427391999 is 999193724.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 427391999 - 2⁸ = 427391743 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 427391999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (427391959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213695999 + 213696000.

It is an arithmetic number, because the mean of its divisors is an integer number (213696000).

Almost surely, 2^427391999 is an apocalyptic number.

427391999 is a deficient number, since it is larger than the sum of its proper divisors (1).

427391999 is an equidigital number, since it uses as much as digits as its factorization.

427391999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1102248, while the sum is 53.

The square root of 427391999 is about 20673.4612244781. The cubic root of 427391999 is about 753.2551840035.

The spelling of 427391999 in words is "four hundred twenty-seven million, three hundred ninety-one thousand, nine hundred ninety-nine".