4028138 has 4 divisors (see below), whose sum is σ = 6042210. Its totient is φ = 2014068.

The previous prime is 4028137. The next prime is 4028173. The reversal of 4028138 is 8318204.

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., 4012009 + 16129 = 2003^2 + 127^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4028137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1007033 + ... + 1007036.

Almost surely, 2^4028138 is an apocalyptic number.

4028138 is a deficient number, since it is larger than the sum of its proper divisors (2014072).

4028138 is a wasteful number, since it uses less digits than its factorization.

4028138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2014071.

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

The square root of 4028138 is about 2007.0221722741. The cubic root of 4028138 is about 159.1114548901. Note that the first 3 decimals are identical.

The spelling of 4028138 in words is "four million, twenty-eight thousand, one hundred thirty-eight".