1906081 has 4 divisors (see below), whose sum is σ = 1920132. Its totient is φ = 1892032.

The previous prime is 1906063. The next prime is 1906087. The reversal of 1906081 is 1806091.

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 1175056 + 731025 = 1084^2 + 855^2 .

It is a cyclic number.

It is not a de Polignac number, because 1906081 - 2¹⁷ = 1775009 is a prime.

It is a super-2 number, since 2×1906081² = 7266289557122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1906087) 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, 6820 + ... + 7093.

It is an arithmetic number, because the mean of its divisors is an integer number (480033).

2^1906081 is an apocalyptic number.

It is an amenable number.

1906081 is a deficient number, since it is larger than the sum of its proper divisors (14051).

1906081 is a wasteful number, since it uses less digits than its factorization.

1906081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14050.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 1906081 is about 1380.6089236275. The cubic root of 1906081 is about 123.9882272902.

The spelling of 1906081 in words is "one million, nine hundred six thousand, eighty-one".