418391 has 2 divisors, whose sum is σ = 418392. Its totient is φ = 418390.

The previous prime is 418381. The next prime is 418423. The reversal of 418391 is 193814.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-418391 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 418391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (418321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 209195 + 209196.

It is an arithmetic number, because the mean of its divisors is an integer number (209196).

2⁴¹⁸³⁹¹ is an apocalyptic number.

418391 is a deficient number, since it is larger than the sum of its proper divisors (1).

418391 is an equidigital number, since it uses as much as digits as its factorization.

418391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The square root of 418391 is about 646.8315081998. The cubic root of 418391 is about 74.7929697798.

The spelling of 418391 in words is "four hundred eighteen thousand, three hundred ninety-one".