428138 has 4 divisors (see below), whose sum is σ = 642210. Its totient is φ = 214068.

The previous prime is 428137. The next prime is 428143. The reversal of 428138 is 831824.

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., 237169 + 190969 = 487^2 + 437^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (428137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107033 + ... + 107036.

2⁴²⁸¹³⁸ is an apocalyptic number.

428138 is a deficient number, since it is larger than the sum of its proper divisors (214072).

428138 is a wasteful number, since it uses less digits than its factorization.

428138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214071.

The product of its digits is 1536, while the sum is 26.

The square root of 428138 is about 654.3225504291. The cubic root of 428138 is about 75.3693191340.

The spelling of 428138 in words is "four hundred twenty-eight thousand, one hundred thirty-eight".