29999991 has 8 divisors (see below), whose sum is σ = 45714304. Its totient is φ = 17142840.

The previous prime is 29999989. The next prime is 29999999. The reversal of 29999991 is 19999992.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 29999991 - 2¹ = 29999989 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 (29999999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 714265 + ... + 714306.

It is an arithmetic number, because the mean of its divisors is an integer number (5714288).

Almost surely, 2^29999991 is an apocalyptic number.

29999991 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

29999991 is a deficient number, since it is larger than the sum of its proper divisors (15714313).

29999991 is a wasteful number, since it uses less digits than its factorization.

29999991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428581.

The product of its digits is 1062882, while the sum is 57.

The square root of 29999991 is about 5477.2247534678. The cubic root of 29999991 is about 310.7232195231.

Subtracting from 29999991 its reverse (19999992), we obtain a palindrome (9999999).

The spelling of 29999991 in words is "twenty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-one".