427781197 has 4 divisors (see below), whose sum is σ = 430506076. Its totient is φ = 425056320.

The previous prime is 427781171. The next prime is 427781201. The reversal of 427781197 is 791187724.

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

It can be written as a sum of positive squares in 2 ways, for example, as 152917956 + 274863241 = 12366^2 + 16579^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-427781197 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 (427781297) 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, 1362204 + ... + 1362517.

It is an arithmetic number, because the mean of its divisors is an integer number (107626519).

Almost surely, 2^427781197 is an apocalyptic number.

It is an amenable number.

427781197 is a deficient number, since it is larger than the sum of its proper divisors (2724879).

427781197 is a wasteful number, since it uses less digits than its factorization.

427781197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2724878.

The product of its digits is 197568, while the sum is 46.

The square root of 427781197 is about 20682.8720684532. The cubic root of 427781197 is about 753.4837614124.

The spelling of 427781197 in words is "four hundred twenty-seven million, seven hundred eighty-one thousand, one hundred ninety-seven".