1640604 has 24 divisors (see below), whose sum is σ = 4375168. Its totient is φ = 468720.

The previous prime is 1640599. The next prime is 1640609. The reversal of 1640604 is 4060461.

1640604 is nontrivially palindromic in base 5.

It is an interprime number because it is at equal distance from previous prime (1640599) and next prime (1640609).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9682 + ... + 9849.

2^1640604 is an apocalyptic number.

1640604 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1640604 is an abundant number, since it is smaller than the sum of its proper divisors (2734564).

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

1640604 is a wasteful number, since it uses less digits than its factorization.

1640604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19545 (or 19543 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1640604 is about 1280.8606481581. The cubic root of 1640604 is about 117.9418462851.

The spelling of 1640604 in words is "one million, six hundred forty thousand, six hundred four".