1640498 has 16 divisors (see below), whose sum is σ = 2704320. Its totient is φ = 742896.

The previous prime is 1640497. The next prime is 1640503. The reversal of 1640498 is 8940461.

It is not an unprimeable number, because it can be changed into a prime (1640497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65 + ... + 1812.

It is an arithmetic number, because the mean of its divisors is an integer number (169020).

2^1640498 is an apocalyptic number.

1640498 is a deficient number, since it is larger than the sum of its proper divisors (1063822).

1640498 is a wasteful number, since it uses less digits than its factorization.

1640498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1921.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 1640498 is about 1280.8192690618. The cubic root of 1640498 is about 117.9393061423.

The spelling of 1640498 in words is "one million, six hundred forty thousand, four hundred ninety-eight".