29981943 has 12 divisors (see below), whose sum is σ = 45586840. Its totient is φ = 18935856.

The previous prime is 29981893. The next prime is 29981977. The reversal of 29981943 is 34918992.

It is not a de Polignac number, because 29981943 - 2¹⁰ = 29980919 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 (29981243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87496 + ... + 87837.

Almost surely, 2^29981943 is an apocalyptic number.

29981943 is a deficient number, since it is larger than the sum of its proper divisors (15604897).

29981943 is a wasteful number, since it uses less digits than its factorization.

29981943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175358 (or 175355 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 29981943 is about 5475.5769559015. The cubic root of 29981943 is about 310.6608966419.

The spelling of 29981943 in words is "twenty-nine million, nine hundred eighty-one thousand, nine hundred forty-three".