29405981 has 4 divisors (see below), whose sum is σ = 32079264. Its totient is φ = 26732700.

The previous prime is 29405969. The next prime is 29405989. The reversal of 29405981 is 18950492.

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-29405981 is a prime.

It is a super-2 number, since 2×29405981² = 1729423437144722, 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 (29405989) 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, 1336625 + ... + 1336646.

It is an arithmetic number, because the mean of its divisors is an integer number (8019816).

Almost surely, 2^29405981 is an apocalyptic number.

It is an amenable number.

29405981 is a deficient number, since it is larger than the sum of its proper divisors (2673283).

29405981 is a wasteful number, since it uses less digits than its factorization.

29405981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2673282.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 29405981 is about 5422.7281879143. The cubic root of 29405981 is about 308.6587246787.

The spelling of 29405981 in words is "twenty-nine million, four hundred five thousand, nine hundred eighty-one".