1605401 has 4 divisors (see below), whose sum is σ = 1834752. Its totient is φ = 1376052.

The previous prime is 1605389. The next prime is 1605413. The reversal of 1605401 is 1045061.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1605389) and next prime (1605413).

It is a cyclic number.

It is not a de Polignac number, because 1605401 - 2¹⁴ = 1589017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1605401.

It is not an unprimeable number, because it can be changed into a prime (1605421) 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, 114665 + ... + 114678.

It is an arithmetic number, because the mean of its divisors is an integer number (458688).

2^1605401 is an apocalyptic number.

It is an amenable number.

1605401 is a deficient number, since it is larger than the sum of its proper divisors (229351).

1605401 is an equidigital number, since it uses as much as digits as its factorization.

1605401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229350.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1605401 is about 1267.0441981241. The cubic root of 1605401 is about 117.0921668874.

The spelling of 1605401 in words is "one million, six hundred five thousand, four hundred one".