1649409 has 12 divisors (see below), whose sum is σ = 2322576. Its totient is φ = 1041048.

The previous prime is 1649393. The next prime is 1649411. The reversal of 1649409 is 9049461.

It is not a de Polignac number, because 1649409 - 2⁴ = 1649393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1649409.

It is not an unprimeable number, because it can be changed into a prime (1649419) 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, 322 + ... + 1844.

It is an arithmetic number, because the mean of its divisors is an integer number (193548).

2^1649409 is an apocalyptic number.

1649409 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1649409 is a deficient number, since it is larger than the sum of its proper divisors (673167).

1649409 is a wasteful number, since it uses less digits than its factorization.

1649409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564 (or 1545 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 1649409 is about 1284.2931908252. The cubic root of 1649409 is about 118.1524649891.

The spelling of 1649409 in words is "one million, six hundred forty-nine thousand, four hundred nine".