40921139 has 4 divisors (see below), whose sum is σ = 46767024. Its totient is φ = 35075256.

The previous prime is 40921081. The next prime is 40921171. The reversal of 40921139 is 93112904.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40921139 - 2¹² = 40917043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40921189) 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 3 ways as a sum of consecutive naturals, for example, 2922932 + ... + 2922945.

It is an arithmetic number, because the mean of its divisors is an integer number (11691756).

Almost surely, 2^40921139 is an apocalyptic number.

40921139 is a deficient number, since it is larger than the sum of its proper divisors (5845885).

40921139 is an equidigital number, since it uses as much as digits as its factorization.

40921139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5845884.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 40921139 is about 6396.9632639245. The cubic root of 40921139 is about 344.6005009544.

The spelling of 40921139 in words is "forty million, nine hundred twenty-one thousand, one hundred thirty-nine".