1640492 has 24 divisors (see below), whose sum is σ = 3363360. Its totient is φ = 685440.

The previous prime is 1640467. The next prime is 1640497. The reversal of 1640492 is 2940461.

It is an Ulam number.

1640492 is a modest number, since divided by 492 gives 164 as remainder.

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, 434 + ... + 1862.

It is an arithmetic number, because the mean of its divisors is an integer number (140140).

2^1640492 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1640492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1681680).

1640492 is an abundant number, since it is smaller than the sum of its proper divisors (1722868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1640492 is a wasteful number, since it uses less digits than its factorization.

1640492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481 (or 1479 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1640492 is about 1280.8169268088. The cubic root of 1640492 is about 117.9391623574.

The spelling of 1640492 in words is "one million, six hundred forty thousand, four hundred ninety-two".