1940905 has 4 divisors (see below), whose sum is σ = 2329092. Its totient is φ = 1552720.

The previous prime is 1940903. The next prime is 1940929. The reversal of 1940905 is 5090491.

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 281961 + 1658944 = 531^2 + 1288^2 .

It is not a de Polignac number, because 1940905 - 2¹ = 1940903 is a prime.

It is a super-2 number, since 2×1940905² = 7534224438050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1940903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194086 + ... + 194095.

It is an arithmetic number, because the mean of its divisors is an integer number (582273).

2^1940905 is an apocalyptic number.

It is an amenable number.

1940905 is a deficient number, since it is larger than the sum of its proper divisors (388187).

1940905 is an equidigital number, since it uses as much as digits as its factorization.

1940905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388186.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 1940905 is about 1393.1636659058. The cubic root of 1940905 is about 124.7387610808.

The spelling of 1940905 in words is "one million, nine hundred forty thousand, nine hundred five".