40143791 has 8 divisors (see below), whose sum is σ = 41631744. Its totient is φ = 38667960.

The previous prime is 40143773. The next prime is 40143799. The reversal of 40143791 is 19734104.

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

It is a cyclic number.

It is not a de Polignac number, because 40143791 - 2¹⁴ = 40127407 is a prime.

It is a super-2 number, since 2×40143791² = 3223047911703362, 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 (40143799) 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, 4010 + ... + 9816.

It is an arithmetic number, because the mean of its divisors is an integer number (5203968).

Almost surely, 2^40143791 is an apocalyptic number.

40143791 is a deficient number, since it is larger than the sum of its proper divisors (1487953).

40143791 is a wasteful number, since it uses less digits than its factorization.

40143791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6061.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 40143791 is about 6335.9127992737. The cubic root of 40143791 is about 342.4044978547.

Adding to 40143791 its reverse (19734104), we get a palindrome (59877895).

The spelling of 40143791 in words is "forty million, one hundred forty-three thousand, seven hundred ninety-one".