29689987 has 4 divisors (see below), whose sum is σ = 30980880. Its totient is φ = 28399096.

The previous prime is 29689969. The next prime is 29689991. The reversal of 29689987 is 78998692.

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-29689987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29689967) 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, 645412 + ... + 645457.

It is an arithmetic number, because the mean of its divisors is an integer number (7745220).

Almost surely, 2^29689987 is an apocalyptic number.

29689987 is a deficient number, since it is larger than the sum of its proper divisors (1290893).

29689987 is a wasteful number, since it uses less digits than its factorization.

29689987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290892.

The product of its digits is 3919104, while the sum is 58.

The square root of 29689987 is about 5448.8518974184. The cubic root of 29689987 is about 309.6492286349.

The spelling of 29689987 in words is "twenty-nine million, six hundred eighty-nine thousand, nine hundred eighty-seven".