1940283991 has 4 divisors (see below), whose sum is σ = 1942044192. Its totient is φ = 1938523792.

The previous prime is 1940283949. The next prime is 1940284019. The reversal of 1940283991 is 1993820491.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1993820491 = 13 ⋅153370807.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1940283991 is a prime.

It is a super-3 number, since 3×1940283991³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1940283931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 878446 + ... + 880651.

It is an arithmetic number, because the mean of its divisors is an integer number (485511048).

Almost surely, 2^1940283991 is an apocalyptic number.

1940283991 is a deficient number, since it is larger than the sum of its proper divisors (1760201).

1940283991 is a wasteful number, since it uses less digits than its factorization.

1940283991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1760200.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 1940283991 is about 44048.6548148749. The cubic root of 1940283991 is about 1247.2545592052.

The spelling of 1940283991 in words is "one billion, nine hundred forty million, two hundred eighty-three thousand, nine hundred ninety-one".