1940691 has 4 divisors (see below), whose sum is σ = 2587592. Its totient is φ = 1293792.

The previous prime is 1940683. The next prime is 1940699. The reversal of 1940691 is 1960491.

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

It is an interprime number because it is at equal distance from previous prime (1940683) and next prime (1940699).

It is not a de Polignac number, because 1940691 - 2³ = 1940683 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1940699) 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, 323446 + ... + 323451.

It is an arithmetic number, because the mean of its divisors is an integer number (646898).

2^1940691 is an apocalyptic number.

1940691 is a deficient number, since it is larger than the sum of its proper divisors (646901).

1940691 is an equidigital number, since it uses as much as digits as its factorization.

1940691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646900.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 1940691 is about 1393.0868601778. The cubic root of 1940691 is about 124.7341764367.

The spelling of 1940691 in words is "one million, nine hundred forty thousand, six hundred ninety-one".