1940454993 has 4 divisors (see below), whose sum is σ = 2587273328. Its totient is φ = 1293636660.

The previous prime is 1940454991. The next prime is 1940455001. The reversal of 1940454993 is 3994540491.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1940454993 - 2¹ = 1940454991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1940454991) 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, 323409163 + ... + 323409168.

It is an arithmetic number, because the mean of its divisors is an integer number (646818332).

Almost surely, 2^1940454993 is an apocalyptic number.

It is an amenable number.

1940454993 is a deficient number, since it is larger than the sum of its proper divisors (646818335).

1940454993 is an equidigital number, since it uses as much as digits as its factorization.

1940454993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646818334.

The product of its (nonzero) digits is 699840, while the sum is 48.

The square root of 1940454993 is about 44050.5958302496. The cubic root of 1940454993 is about 1247.2911993327.

The spelling of 1940454993 in words is "one billion, nine hundred forty million, four hundred fifty-four thousand, nine hundred ninety-three".