1649725 has 24 divisors (see below), whose sum is σ = 2553408. Its totient is φ = 1027200.

The previous prime is 1649707. The next prime is 1649737. The reversal of 1649725 is 5279461.

It is not a de Polignac number, because 1649725 - 2⁵ = 1649693 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1497 + ... + 2353.

It is an arithmetic number, because the mean of its divisors is an integer number (106392).

2^1649725 is an apocalyptic number.

It is an amenable number.

1649725 is a deficient number, since it is larger than the sum of its proper divisors (903683).

1649725 is a wasteful number, since it uses less digits than its factorization.

1649725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885 (or 880 counting only the distinct ones).

The product of its digits is 15120, while the sum is 34.

The square root of 1649725 is about 1284.4162098012. The cubic root of 1649725 is about 118.1600098723.

It can be divided in two parts, 164 and 9725, that added together give a palindrome (9889).

The spelling of 1649725 in words is "one million, six hundred forty-nine thousand, seven hundred twenty-five".