29987143 has 4 divisors (see below), whose sum is σ = 30139560. Its totient is φ = 29834728.

The previous prime is 29987141. The next prime is 29987161. The reversal of 29987143 is 34178992.

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

It is a cyclic number.

It is not a de Polignac number, because 29987143 - 2¹ = 29987141 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 29987143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29987141) 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, 75913 + ... + 76306.

It is an arithmetic number, because the mean of its divisors is an integer number (7534890).

Almost surely, 2^29987143 is an apocalyptic number.

29987143 is a deficient number, since it is larger than the sum of its proper divisors (152417).

29987143 is a wasteful number, since it uses less digits than its factorization.

29987143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152416.

The product of its digits is 108864, while the sum is 43.

The square root of 29987143 is about 5476.0517711212. The cubic root of 29987143 is about 310.6788557101.

The spelling of 29987143 in words is "twenty-nine million, nine hundred eighty-seven thousand, one hundred forty-three".