1404661 has 4 divisors (see below), whose sum is σ = 1415052. Its totient is φ = 1394272.

The previous prime is 1404653. The next prime is 1404671. The reversal of 1404661 is 1664041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1664041 = 53 ⋅31397.

It can be written as a sum of positive squares in 2 ways, for example, as 463761 + 940900 = 681^2 + 970^2 .

It is a cyclic number.

It is not a de Polignac number, because 1404661 - 2³ = 1404653 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

1404661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1404671) 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, 4990 + ... + 5263.

It is an arithmetic number, because the mean of its divisors is an integer number (353763).

2^1404661 is an apocalyptic number.

It is an amenable number.

1404661 is a deficient number, since it is larger than the sum of its proper divisors (10391).

1404661 is a wasteful number, since it uses less digits than its factorization.

1404661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10390.

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

The square root of 1404661 is about 1185.1839519670. The cubic root of 1404661 is about 111.9929045250.

The spelling of 1404661 in words is "one million, four hundred four thousand, six hundred sixty-one".