428242431 has 4 divisors (see below), whose sum is σ = 570989912. Its totient is φ = 285494952.

The previous prime is 428242429. The next prime is 428242433. The reversal of 428242431 is 134242824.

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

It is an interprime number because it is at equal distance from previous prime (428242429) and next prime (428242433).

It is not a de Polignac number, because 428242431 - 2¹ = 428242429 is a prime.

It is a super-2 number, since 2×428242431² = 366783159417579522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428242433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71373736 + ... + 71373741.

It is an arithmetic number, because the mean of its divisors is an integer number (142747478).

Almost surely, 2^428242431 is an apocalyptic number.

428242431 is a deficient number, since it is larger than the sum of its proper divisors (142747481).

428242431 is a wasteful number, since it uses less digits than its factorization.

428242431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142747480.

The product of its digits is 12288, while the sum is 30.

The square root of 428242431 is about 20694.0192084573. The cubic root of 428242431 is about 753.7544663921.

The spelling of 428242431 in words is "four hundred twenty-eight million, two hundred forty-two thousand, four hundred thirty-one".