2606381 has 4 divisors (see below), whose sum is σ = 2655612. Its totient is φ = 2557152.

The previous prime is 2606377. The next prime is 2606393. The reversal of 2606381 is 1836062.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1190281 + 1416100 = 1091^2 + 1190^2 .

It is a cyclic number.

It is not a de Polignac number, because 2606381 - 2² = 2606377 is a prime.

It is a super-2 number, since 2×2606381² = 13586443834322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2606381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2606311) 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, 24536 + ... + 24641.

It is an arithmetic number, because the mean of its divisors is an integer number (663903).

2^2606381 is an apocalyptic number.

It is an amenable number.

2606381 is a deficient number, since it is larger than the sum of its proper divisors (49231).

2606381 is an equidigital number, since it uses as much as digits as its factorization.

2606381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49230.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 2606381 is about 1614.4290012261. The cubic root of 2606381 is about 137.6192860170.

The spelling of 2606381 in words is "two million, six hundred six thousand, three hundred eighty-one".