40993891 has 16 divisors (see below), whose sum is σ = 43934688. Its totient is φ = 38188800.

The previous prime is 40993879. The next prime is 40993903. The reversal of 40993891 is 19839904.

It is an interprime number because it is at equal distance from previous prime (40993879) and next prime (40993903).

It is a cyclic number.

It is not a de Polignac number, because 40993891 - 2¹⁹ = 40469603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40993861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92316 + ... + 92758.

It is an arithmetic number, because the mean of its divisors is an integer number (2745918).

Almost surely, 2^40993891 is an apocalyptic number.

40993891 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

40993891 is a deficient number, since it is larger than the sum of its proper divisors (2940797).

40993891 is a wasteful number, since it uses less digits than its factorization.

40993891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 40993891 is about 6402.6471869064. The cubic root of 40993891 is about 344.8045970420.

The spelling of 40993891 in words is "forty million, nine hundred ninety-three thousand, eight hundred ninety-one".