29845981 has 6 divisors (see below), whose sum is σ = 32806046. Its totient is φ = 27132600.

The previous prime is 29845969. The next prime is 29846023. The reversal of 29845981 is 18954892.

It can be written as a sum of positive squares in only one way, i.e., 29052100 + 793881 = 5390^2 + 891^2 .

It is a de Polignac number, because none of the positive numbers 2^k-29845981 is a prime.

It is a super-2 number, since 2×29845981² = 1781565163704722, 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 (29845481) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 123210 + ... + 123451.

Almost surely, 2^29845981 is an apocalyptic number.

It is an amenable number.

29845981 is a deficient number, since it is larger than the sum of its proper divisors (2960065).

29845981 is a wasteful number, since it uses less digits than its factorization.

29845981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246683 (or 246672 counting only the distinct ones).

The product of its digits is 207360, while the sum is 46.

The square root of 29845981 is about 5463.1475359906. The cubic root of 29845981 is about 310.1905903958.

The spelling of 29845981 in words is "twenty-nine million, eight hundred forty-five thousand, nine hundred eighty-one".