29981939 has 4 divisors (see below), whose sum is σ = 32288256. Its totient is φ = 27675624.

The previous prime is 29981893. The next prime is 29981977. The reversal of 29981939 is 93918992.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29981939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (29981239) 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, 1153139 + ... + 1153164.

It is an arithmetic number, because the mean of its divisors is an integer number (8072064).

Almost surely, 2^29981939 is an apocalyptic number.

29981939 is a deficient number, since it is larger than the sum of its proper divisors (2306317).

29981939 is a wasteful number, since it uses less digits than its factorization.

29981939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2306316.

The product of its digits is 314928, while the sum is 50.

The square root of 29981939 is about 5475.5765906432. The cubic root of 29981939 is about 310.6608828265.

The spelling of 29981939 in words is "twenty-nine million, nine hundred eighty-one thousand, nine hundred thirty-nine".