1640325 has 12 divisors (see below), whose sum is σ = 2712128. Its totient is φ = 874800.

The previous prime is 1640323. The next prime is 1640333. The reversal of 1640325 is 5230461.

It is a happy number.

It is not a de Polignac number, because 1640325 - 2¹ = 1640323 is a prime.

It is a super-2 number, since 2×1640325² = 5381332211250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640323) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10861 + ... + 11010.

2^1640325 is an apocalyptic number.

1640325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1640325 is a deficient number, since it is larger than the sum of its proper divisors (1071803).

1640325 is a wasteful number, since it uses less digits than its factorization.

1640325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21884 (or 21879 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1640325 is about 1280.7517323822. The cubic root of 1640325 is about 117.9351602027.

Adding to 1640325 its reverse (5230461), we get a palindrome (6870786).

The spelling of 1640325 in words is "one million, six hundred forty thousand, three hundred twenty-five".