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29870849 = 277107837
BaseRepresentation
bin111000111110…
…0101100000001
32002012121002202
41301330230001
530121331344
62544122545
7511620011
oct161745401
962177082
1029870849
1115952458
12a006455
13625b278
143d77c41
15295094e
hex1c7cb01

29870849 has 4 divisors (see below), whose sum is σ = 29978964. Its totient is φ = 29762736.

The previous prime is 29870839. The next prime is 29870857. The reversal of 29870849 is 94807892.

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 4870849 + 25000000 = 2207^2 + 5000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-29870849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29870809) 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, 53642 + ... + 54195.

It is an arithmetic number, because the mean of its divisors is an integer number (7494741).

Almost surely, 229870849 is an apocalyptic number.

It is an amenable number.

29870849 is a deficient number, since it is larger than the sum of its proper divisors (108115).

29870849 is a wasteful number, since it uses less digits than its factorization.

29870849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108114.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 29870849 is about 5465.4230394362. The cubic root of 29870849 is about 310.2767178846.

The spelling of 29870849 in words is "twenty-nine million, eight hundred seventy thousand, eight hundred forty-nine".

Divisors: 1 277 107837 29870849