1640412 has 60 divisors (see below), whose sum is σ = 4411176. Its totient is φ = 531360.

The previous prime is 1640399. The next prime is 1640423. The reversal of 1640412 is 2140461.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 19723 + ... + 19805.

2^1640412 is an apocalyptic number.

1640412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1640412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2205588).

1640412 is an abundant number, since it is smaller than the sum of its proper divisors (2770764).

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

1640412 is a wasteful number, since it uses less digits than its factorization.

1640412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1640412 is about 1280.7856963599. The cubic root of 1640412 is about 117.9372451914.

Adding to 1640412 its reverse (2140461), we get a palindrome (3780873).

The spelling of 1640412 in words is "one million, six hundred forty thousand, four hundred twelve".