1640772 has 72 divisors (see below), whose sum is σ = 5031936. Its totient is φ = 440064.

The previous prime is 1640761. The next prime is 1640773. The reversal of 1640772 is 2770461.

It is not an unprimeable number, because it can be changed into a prime (1640773) 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 23 ways as a sum of consecutive naturals, for example, 4093 + ... + 4475.

It is an arithmetic number, because the mean of its divisors is an integer number (69888).

2^1640772 is an apocalyptic number.

1640772 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 1640772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2515968).

1640772 is an abundant number, since it is smaller than the sum of its proper divisors (3391164).

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

1640772 is a wasteful number, since it uses less digits than its factorization.

1640772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 1640772 is about 1280.9262273839. The cubic root of 1640772 is about 117.9458719476.

The spelling of 1640772 in words is "one million, six hundred forty thousand, seven hundred seventy-two".