1606401 has 6 divisors (see below), whose sum is σ = 2320370. Its totient is φ = 1070928.

The previous prime is 1606399. The next prime is 1606403. The reversal of 1606401 is 1046061.

It is an interprime number because it is at equal distance from previous prime (1606399) and next prime (1606403).

It can be written as a sum of positive squares in only one way, i.e., 998001 + 608400 = 999^2 + 780^2 .

It is not a de Polignac number, because 1606401 - 2¹ = 1606399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1606403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 89236 + ... + 89253.

2^1606401 is an apocalyptic number.

It is an amenable number.

1606401 is a deficient number, since it is larger than the sum of its proper divisors (713969).

1606401 is a wasteful number, since it uses less digits than its factorization.

1606401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178495 (or 178492 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1606401 is about 1267.4387559168. The cubic root of 1606401 is about 117.1164739740.

It can be divided in two parts, 160 and 6401, that added together give a 8-th power (6561 = 3⁸).

The spelling of 1606401 in words is "one million, six hundred six thousand, four hundred one".