29919438639 has 16 divisors (see below), whose sum is σ = 44349642240. Its totient is φ = 19935245880.

The previous prime is 29919438617. The next prime is 29919438671. The reversal of 29919438639 is 93683491992.

It is not a de Polignac number, because 29919438639 - 2¹² = 29919434543 is a prime.

It is a super-3 number, since 3×29919438639³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29919438739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 257047 + ... + 354840.

It is an arithmetic number, because the mean of its divisors is an integer number (2771852640).

Almost surely, 2^29919438639 is an apocalyptic number.

29919438639 is a deficient number, since it is larger than the sum of its proper divisors (14430203601).

29919438639 is a wasteful number, since it uses less digits than its factorization.

29919438639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613707 (or 613701 counting only the distinct ones).

The product of its digits is 22674816, while the sum is 63.

The spelling of 29919438639 in words is "twenty-nine billion, nine hundred nineteen million, four hundred thirty-eight thousand, six hundred thirty-nine".