1640364 has 72 divisors (see below), whose sum is σ = 4538688. Its totient is φ = 456960.

The previous prime is 1640333. The next prime is 1640393. The reversal of 1640364 is 4630461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38127 + ... + 38169.

2^1640364 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 1640364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2269344).

1640364 is an abundant number, since it is smaller than the sum of its proper divisors (2898324).

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

1640364 is a wasteful number, since it uses less digits than its factorization.

1640364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 1640364 is about 1280.7669577249. The cubic root of 1640364 is about 117.9360948619.

The spelling of 1640364 in words is "one million, six hundred forty thousand, three hundred sixty-four".