29911993 has 16 divisors (see below), whose sum is σ = 32970240. Its totient is φ = 27014400.

The previous prime is 29911979. The next prime is 29912009. The reversal of 29911993 is 39911992.

It is a cyclic number.

It is not a de Polignac number, because 29911993 - 2⁹ = 29911481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29911913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111063 + ... + 111331.

It is an arithmetic number, because the mean of its divisors is an integer number (2060640).

Almost surely, 2^29911993 is an apocalyptic number.

It is an amenable number.

29911993 is a deficient number, since it is larger than the sum of its proper divisors (3058247).

29911993 is a wasteful number, since it uses less digits than its factorization.

29911993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528.

The product of its digits is 39366, while the sum is 43.

The square root of 29911993 is about 5469.1857712095. The cubic root of 29911993 is about 310.4191105393.

Subtracting 29911993 from its reverse (39911992), we obtain a palindrome (9999999).

The spelling of 29911993 in words is "twenty-nine million, nine hundred eleven thousand, nine hundred ninety-three".