1616904 has 48 divisors (see below), whose sum is σ = 4640220. Its totient is φ = 506880.

The previous prime is 1616899. The next prime is 1616939. The reversal of 1616904 is 4096161.

It can be written as a sum of positive squares in 2 ways, for example, as 1368900 + 248004 = 1170^2 + 498^2 .

It is a super-2 number, since 2×1616904² = 5228757090432, which contains 22 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 564 + ... + 1884.

2^1616904 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 1616904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2320110).

1616904 is an abundant number, since it is smaller than the sum of its proper divisors (3023316).

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

1616904 is a wasteful number, since it uses less digits than its factorization.

1616904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1350 (or 1343 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1616904 is about 1271.5754008316. The cubic root of 1616904 is about 117.3711640524.

The spelling of 1616904 in words is "one million, six hundred sixteen thousand, nine hundred four".