1940144591 has 8 divisors (see below), whose sum is σ = 2418881664. Its totient is φ = 1511800920.

The previous prime is 1940144581. The next prime is 1940144597. The reversal of 1940144591 is 1954410491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1940144591 is a prime.

It is a super-2 number, since 2×1940144591² = 7528322067973114562, which contains 22 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 (1940144597) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12598265 + ... + 12598418.

It is an arithmetic number, because the mean of its divisors is an integer number (302360208).

Almost surely, 2^1940144591 is an apocalyptic number.

1940144591 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1940144591 is a deficient number, since it is larger than the sum of its proper divisors (478737073).

1940144591 is a wasteful number, since it uses less digits than its factorization.

1940144591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25196701.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 1940144591 is about 44047.0724452829. The cubic root of 1940144591 is about 1247.2246887583.

The spelling of 1940144591 in words is "one billion, nine hundred forty million, one hundred forty-four thousand, five hundred ninety-one".