40005001639 has 4 divisors (see below), whose sum is σ = 40660821400. Its totient is φ = 39349181880.

The previous prime is 40005001601. The next prime is 40005001643. The reversal of 40005001639 is 93610050004.

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 40005001639 - 2¹³ = 40004993447 is a prime.

It is a super-2 number, since 2×40005001639² (a number of 22 digits) 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 (40005001649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327909789 + ... + 327909910.

It is an arithmetic number, because the mean of its divisors is an integer number (10165205350).

Almost surely, 2^40005001639 is an apocalyptic number.

40005001639 is a deficient number, since it is larger than the sum of its proper divisors (655819761).

40005001639 is an equidigital number, since it uses as much as digits as its factorization.

40005001639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655819760.

The product of its (nonzero) digits is 3240, while the sum is 28.

The spelling of 40005001639 in words is "forty billion, five million, one thousand, six hundred thirty-nine".