29681905 has 24 divisors (see below), whose sum is σ = 39759552. Its totient is φ = 21252000.

The previous prime is 29681893. The next prime is 29681941. The reversal of 29681905 is 50918692.

It is not a de Polignac number, because 29681905 - 2⁷ = 29681777 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42610 + ... + 43300.

It is an arithmetic number, because the mean of its divisors is an integer number (1656648).

Almost surely, 2^29681905 is an apocalyptic number.

It is an amenable number.

29681905 is a deficient number, since it is larger than the sum of its proper divisors (10077647).

29681905 is a wasteful number, since it uses less digits than its factorization.

29681905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789 (or 778 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 29681905 is about 5448.1102228204. The cubic root of 29681905 is about 309.6211292381.

The spelling of 29681905 in words is "twenty-nine million, six hundred eighty-one thousand, nine hundred five".