428426 has 4 divisors (see below), whose sum is σ = 642642. Its totient is φ = 214212.

The previous prime is 428411. The next prime is 428429. The reversal of 428426 is 624824.

428426 is nontrivially palindromic in base 5.

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

It can be written as a sum of positive squares in only one way, i.e., 421201 + 7225 = 649^2 + 85^2 .

It is a d-powerful number, because it can be written as 4⁵ + 2 + 4⁷ + 8 + 2¹⁷ + 6⁷ .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 428395 and 428404.

It is not an unprimeable number, because it can be changed into a prime (428429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107105 + ... + 107108.

2⁴²⁸⁴²⁶ is an apocalyptic number.

428426 is a deficient number, since it is larger than the sum of its proper divisors (214216).

428426 is a wasteful number, since it uses less digits than its factorization.

428426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214215.

The product of its digits is 3072, while the sum is 26.

The square root of 428426 is about 654.5425883776. The cubic root of 428426 is about 75.3862151648.

The spelling of 428426 in words is "four hundred twenty-eight thousand, four hundred twenty-six".