1725138 has 40 divisors (see below), whose sum is σ = 4042368. Its totient is φ = 548856.

The previous prime is 1725133. The next prime is 1725151. The reversal of 1725138 is 8315271.

It is a super-2 number, since 2×1725138² = 5952202238088, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (1725133) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3495 + ... + 3957.

2^1725138 is an apocalyptic number.

1725138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1725138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2021184).

1725138 is an abundant number, since it is smaller than the sum of its proper divisors (2317230).

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

1725138 is a wasteful number, since it uses less digits than its factorization.

1725138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500 (or 491 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 1725138 is about 1313.4450883078. The cubic root of 1725138 is about 119.9337133908.

The spelling of 1725138 in words is "one million, seven hundred twenty-five thousand, one hundred thirty-eight".