1940391 has 12 divisors (see below), whose sum is σ = 2879032. Its totient is φ = 1258416.

The previous prime is 1940381. The next prime is 1940399. The reversal of 1940391 is 1930491.

It is not a de Polignac number, because 1940391 - 2⁶ = 1940327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1940399) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2581 + ... + 3246.

2^1940391 is an apocalyptic number.

1940391 is a deficient number, since it is larger than the sum of its proper divisors (938641).

1940391 is a wasteful number, since it uses less digits than its factorization.

1940391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5870 (or 5867 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 1940391 is about 1392.9791814668. The cubic root of 1940391 is about 124.7277487981.

The spelling of 1940391 in words is "one million, nine hundred forty thousand, three hundred ninety-one".