1613604 has 24 divisors (see below), whose sum is σ = 3846528. Its totient is φ = 526240.

The previous prime is 1613597. The next prime is 1613609. The reversal of 1613604 is 4063161.

Added to its reverse (4063161) it gives a triangular number (5676765 = T₃₃₆₉).

It is not an unprimeable number, because it can be changed into a prime (1613609) 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, 867 + ... + 1994.

It is an arithmetic number, because the mean of its divisors is an integer number (160272).

2^1613604 is an apocalyptic number.

It is an amenable number.

1613604 is an abundant number, since it is smaller than the sum of its proper divisors (2232924).

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

1613604 is a wasteful number, since it uses less digits than its factorization.

1613604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2915 (or 2913 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1613604 is about 1270.2771351166. The cubic root of 1613604 is about 117.2912605986.

Adding to 1613604 its reverse (4063161), we get a palindrome (5676765).

The spelling of 1613604 in words is "one million, six hundred thirteen thousand, six hundred four".