40819439 has 4 divisors (see below), whose sum is σ = 40834920. Its totient is φ = 40803960.

The previous prime is 40819423. The next prime is 40819447. The reversal of 40819439 is 93491804.

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 40819439 - 2⁴ = 40819423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40819459) 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, 2684 + ... + 9425.

It is an arithmetic number, because the mean of its divisors is an integer number (10208730).

Almost surely, 2^40819439 is an apocalyptic number.

40819439 is a deficient number, since it is larger than the sum of its proper divisors (15481).

40819439 is a wasteful number, since it uses less digits than its factorization.

40819439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15480.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 40819439 is about 6389.0092346153. The cubic root of 40819439 is about 344.3147892599.

The spelling of 40819439 in words is "forty million, eight hundred nineteen thousand, four hundred thirty-nine".