428431 has 4 divisors (see below), whose sum is σ = 451000. Its totient is φ = 405864.

The previous prime is 428429. The next prime is 428471. The reversal of 428431 is 134824.

428431 = T₉₃ + T₉₄ + ... + T₁₄₉.

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 428431 - 2¹ = 428429 is a prime.

It is a super-2 number, since 2×428431² = 367106243522, 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 (428401) 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, 11256 + ... + 11293.

It is an arithmetic number, because the mean of its divisors is an integer number (112750).

2⁴²⁸⁴³¹ is an apocalyptic number.

428431 is a deficient number, since it is larger than the sum of its proper divisors (22569).

428431 is a wasteful number, since it uses less digits than its factorization.

428431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22568.

The product of its digits is 768, while the sum is 22.

The square root of 428431 is about 654.5464078276. The cubic root of 428431 is about 75.3865084318.

The spelling of 428431 in words is "four hundred twenty-eight thousand, four hundred thirty-one".