428331431 has 4 divisors (see below), whose sum is σ = 467270664. Its totient is φ = 389392200.

The previous prime is 428331403. The next prime is 428331481. The reversal of 428331431 is 134133824.

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 428331431 - 2¹⁴ = 428315047 is a prime.

It is a super-2 number, since 2×428331431² = 366935629565015522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 428331394 and 428331403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428331481) 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, 19469600 + ... + 19469621.

It is an arithmetic number, because the mean of its divisors is an integer number (116817666).

Almost surely, 2^428331431 is an apocalyptic number.

428331431 is a deficient number, since it is larger than the sum of its proper divisors (38939233).

428331431 is a wasteful number, since it uses less digits than its factorization.

428331431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38939232.

The product of its digits is 6912, while the sum is 29.

The square root of 428331431 is about 20696.1694764998. The cubic root of 428331431 is about 753.8066794191.

The spelling of 428331431 in words is "four hundred twenty-eight million, three hundred thirty-one thousand, four hundred thirty-one".