672138 has 28 divisors (see below), whose sum is σ = 1514898. Its totient is φ = 223560.

The previous prime is 672137. The next prime is 672143. The reversal of 672138 is 831276.

It can be written as a sum of positive squares in only one way, i.e., 613089 + 59049 = 783^2 + 243^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 672138.

It is not an unprimeable number, because it can be changed into a prime (672131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 1228 + ... + 1688.

2⁶⁷²¹³⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 672138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (757449).

672138 is an abundant number, since it is smaller than the sum of its proper divisors (842760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

672138 is an equidigital number, since it uses as much as digits as its factorization.

672138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481 (or 466 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 672138 is about 819.8402283372. The cubic root of 672138 is about 87.5963781576.

The spelling of 672138 in words is "six hundred seventy-two thousand, one hundred thirty-eight".