29912381 has 4 divisors (see below), whose sum is σ = 29932032. Its totient is φ = 29892732.

The previous prime is 29912359. The next prime is 29912413. The reversal of 29912381 is 18321992.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29912381 is a prime.

It is a super-2 number, since 2×29912381² = 1789501074178322, which 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 (29912321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7331 + ... + 10656.

It is an arithmetic number, because the mean of its divisors is an integer number (7483008).

Almost surely, 2^29912381 is an apocalyptic number.

It is an amenable number.

29912381 is a deficient number, since it is larger than the sum of its proper divisors (19651).

29912381 is a wasteful number, since it uses less digits than its factorization.

29912381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19650.

The product of its digits is 7776, while the sum is 35.

The square root of 29912381 is about 5469.2212425536. The cubic root of 29912381 is about 310.4204527222.

The spelling of 29912381 in words is "twenty-nine million, nine hundred twelve thousand, three hundred eighty-one".