1616404 has 12 divisors (see below), whose sum is σ = 2857428. Its totient is φ = 800000.

The previous prime is 1616401. The next prime is 1616429. The reversal of 1616404 is 4046161.

It can be written as a sum of positive squares in 2 ways, for example, as 810000 + 806404 = 900^2 + 898^2 .

It is a super-2 number, since 2×1616404² = 5225523782432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616401) 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, 1597 + ... + 2404.

It is an arithmetic number, because the mean of its divisors is an integer number (238119).

2^1616404 is an apocalyptic number.

It is an amenable number.

1616404 is a deficient number, since it is larger than the sum of its proper divisors (1241024).

1616404 is a wasteful number, since it uses less digits than its factorization.

1616404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4106 (or 4104 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1616404 is about 1271.3787791213. The cubic root of 1616404 is about 117.3590644612.

It can be divided in two parts, 1616 and 404, that multiplied together give a square (652864 = 808²).

The spelling of 1616404 in words is "one million, six hundred sixteen thousand, four hundred four".