1940591 has 4 divisors (see below), whose sum is σ = 1943400. Its totient is φ = 1937784.

The previous prime is 1940573. The next prime is 1940597. The reversal of 1940591 is 1950491.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1950491 = 461 ⋅4231.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1940591 is a prime.

It is a Duffinian number.

1940591 is a Rhonda number in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1940597) 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, 440 + ... + 2018.

It is an arithmetic number, because the mean of its divisors is an integer number (485850).

2^1940591 is an apocalyptic number.

1940591 is a deficient number, since it is larger than the sum of its proper divisors (2809).

1940591 is a wasteful number, since it uses less digits than its factorization.

1940591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2808.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 1940591 is about 1393.0509681989. The cubic root of 1940591 is about 124.7320339641.

The spelling of 1940591 in words is "one million, nine hundred forty thousand, five hundred ninety-one".