427307991 has 12 divisors (see below), whose sum is σ = 626248056. Its totient is φ = 258974320.

The previous prime is 427307981. The next prime is 427308019. The reversal of 427307991 is 199703724.

It is not a de Polignac number, because 427307991 - 2⁹ = 427307479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (427307911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 588216 + ... + 588941.

It is an arithmetic number, because the mean of its divisors is an integer number (52187338).

Almost surely, 2^427307991 is an apocalyptic number.

427307991 is a deficient number, since it is larger than the sum of its proper divisors (198940065).

427307991 is a wasteful number, since it uses less digits than its factorization.

427307991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177182 (or 1177171 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 42.

The square root of 427307991 is about 20671.4293410011. The cubic root of 427307991 is about 753.2058275905.

It can be divided in two parts, 42730 and 7991, that added together give a triangular number (50721 = T₃₁₈).

The spelling of 427307991 in words is "four hundred twenty-seven million, three hundred seven thousand, nine hundred ninety-one".