29643989 has 4 divisors (see below), whose sum is σ = 29658924. Its totient is φ = 29629056.

The previous prime is 29643983. The next prime is 29644037. The reversal of 29643989 is 98934692.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17098225 + 12545764 = 4135^2 + 3542^2 .

It is a cyclic number.

It is not a de Polignac number, because 29643989 - 2⁴ = 29643973 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 (29643983) 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, 3932 + ... + 8645.

It is an arithmetic number, because the mean of its divisors is an integer number (7414731).

Almost surely, 2^29643989 is an apocalyptic number.

It is an amenable number.

29643989 is a deficient number, since it is larger than the sum of its proper divisors (14935).

29643989 is a wasteful number, since it uses less digits than its factorization.

29643989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14934.

The product of its digits is 839808, while the sum is 50.

The square root of 29643989 is about 5444.6293721428. The cubic root of 29643989 is about 309.4892352211.

The spelling of 29643989 in words is "twenty-nine million, six hundred forty-three thousand, nine hundred eighty-nine".