1649791 has 16 divisors (see below), whose sum is σ = 1975680. Its totient is φ = 1357920.

The previous prime is 1649783. The next prime is 1649797. The reversal of 1649791 is 1979461.

It is a cyclic number.

It is not a de Polignac number, because 1649791 - 2³ = 1649783 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1649791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11800 + ... + 11938.

It is an arithmetic number, because the mean of its divisors is an integer number (123480).

2^1649791 is an apocalyptic number.

1649791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1649791 is a deficient number, since it is larger than the sum of its proper divisors (325889).

1649791 is a wasteful number, since it uses less digits than its factorization.

1649791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246.

The product of its digits is 13608, while the sum is 37.

The square root of 1649791 is about 1284.4419021505. The cubic root of 1649791 is about 118.1615855807.

The spelling of 1649791 in words is "one million, six hundred forty-nine thousand, seven hundred ninety-one".