1906145 has 8 divisors (see below), whose sum is σ = 2330856. Its totient is φ = 1495936.

The previous prime is 1906139. The next prime is 1906153. The reversal of 1906145 is 5416091.

It can be written as a sum of positive squares in 4 ways, for example, as 53824 + 1852321 = 232^2 + 1361^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1906145 - 2¹⁰ = 1905121 is a prime.

It is a super-2 number, since 2×1906145² = 7266777522050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3332 + ... + 3861.

It is an arithmetic number, because the mean of its divisors is an integer number (291357).

2^1906145 is an apocalyptic number.

It is an amenable number.

1906145 is a deficient number, since it is larger than the sum of its proper divisors (424711).

1906145 is an equidigital number, since it uses as much as digits as its factorization.

1906145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7251.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1906145 is about 1380.6321016114. The cubic root of 1906145 is about 123.9896149818.

The spelling of 1906145 in words is "one million, nine hundred six thousand, one hundred forty-five".