427563391 has 4 divisors (see below), whose sum is σ = 427620232. Its totient is φ = 427506552.

The previous prime is 427563361. The next prime is 427563419. The reversal of 427563391 is 193365724.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 427563391 - 2⁵ = 427563359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (427563341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15036 + ... + 32881.

It is an arithmetic number, because the mean of its divisors is an integer number (106905058).

Almost surely, 2^427563391 is an apocalyptic number.

427563391 is a deficient number, since it is larger than the sum of its proper divisors (56841).

427563391 is an equidigital number, since it uses as much as digits as its factorization.

427563391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56840.

The product of its digits is 136080, while the sum is 40.

The square root of 427563391 is about 20677.6060268107. The cubic root of 427563391 is about 753.3558602439.

It can be divided in two parts, 4275633 and 91, that added together give a palindrome (4275724).

The spelling of 427563391 in words is "four hundred twenty-seven million, five hundred sixty-three thousand, three hundred ninety-one".