1640928 has 24 divisors (see below), whose sum is σ = 4307688. Its totient is φ = 546944.

The previous prime is 1640927. The next prime is 1640929. The reversal of 1640928 is 8290461.

It is an interprime number because it is at equal distance from previous prime (1640927) and next prime (1640929).

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 1640895 and 1640904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8451 + ... + 8642.

It is an arithmetic number, because the mean of its divisors is an integer number (179487).

2^1640928 is an apocalyptic number.

It is an amenable number.

1640928 is an abundant number, since it is smaller than the sum of its proper divisors (2666760).

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

1640928 is a wasteful number, since it uses less digits than its factorization.

1640928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17106 (or 17098 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1640928 is about 1280.9871193732. The cubic root of 1640928 is about 117.9496098167.

The spelling of 1640928 in words is "one million, six hundred forty thousand, nine hundred twenty-eight".