29681893 has 2 divisors, whose sum is σ = 29681894. Its totient is φ = 29681892.

The previous prime is 29681887. The next prime is 29681941. The reversal of 29681893 is 39818692.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17164449 + 12517444 = 4143^2 + 3538^2 .

It is a cyclic number.

It is not a de Polignac number, because 29681893 - 2¹³ = 29673701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29687893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14840946 + 14840947.

It is an arithmetic number, because the mean of its divisors is an integer number (14840947).

Almost surely, 2^29681893 is an apocalyptic number.

It is an amenable number.

29681893 is a deficient number, since it is larger than the sum of its proper divisors (1).

29681893 is an equidigital number, since it uses as much as digits as its factorization.

29681893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 46.

The square root of 29681893 is about 5448.1091215210. The cubic root of 29681893 is about 309.6210875129.

The spelling of 29681893 in words is "twenty-nine million, six hundred eighty-one thousand, eight hundred ninety-three".