1649947 has 8 divisors (see below), whose sum is σ = 1789760. Its totient is φ = 1521000.

The previous prime is 1649927. The next prime is 1649959. The reversal of 1649947 is 7499461.

It is a happy number.

It is not a de Polignac number, because 1649947 - 2⁷ = 1649819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1649917) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1822 + ... + 2572.

It is an arithmetic number, because the mean of its divisors is an integer number (223720).

2^1649947 is an apocalyptic number.

1649947 is a deficient number, since it is larger than the sum of its proper divisors (139813).

1649947 is an frugal number, since it uses more digits than its factorization.

1649947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790 (or 764 counting only the distinct ones).

The product of its digits is 54432, while the sum is 40.

The square root of 1649947 is about 1284.5026274788. The cubic root of 1649947 is about 118.1653098153.

The spelling of 1649947 in words is "one million, six hundred forty-nine thousand, nine hundred forty-seven".