2665404 has 54 divisors (see below), whose sum is σ = 7842744. Its totient is φ = 761040.

The previous prime is 2665391. The next prime is 2665409. The reversal of 2665404 is 4045662.

It is a happy number.

2665404 is a `hidden beast` number, since 2 + 6 + 654 + 0 + 4 = 666.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665409) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1009 + ... + 2519.

It is an arithmetic number, because the mean of its divisors is an integer number (145236).

2^2665404 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 2665404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3921372).

2665404 is an abundant number, since it is smaller than the sum of its proper divisors (5177340).

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

2665404 is a wasteful number, since it uses less digits than its factorization.

2665404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1535 (or 1523 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 2665404 is about 1632.6065049485. The cubic root of 2665404 is about 138.6503643105.

The spelling of 2665404 in words is "two million, six hundred sixty-five thousand, four hundred four".