29887381 has 2 divisors, whose sum is σ = 29887382. Its totient is φ = 29887380.

The previous prime is 29887367. The next prime is 29887409. The reversal of 29887381 is 18378892.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25664356 + 4223025 = 5066^2 + 2055^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29887381 is a prime.

It is a super-2 number, since 2×29887381² = 1786511086078322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29887331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14943690 + 14943691.

It is an arithmetic number, because the mean of its divisors is an integer number (14943691).

Almost surely, 2^29887381 is an apocalyptic number.

It is an amenable number.

29887381 is a deficient number, since it is larger than the sum of its proper divisors (1).

29887381 is an equidigital number, since it uses as much as digits as its factorization.

29887381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 46.

The square root of 29887381 is about 5466.9352474673. The cubic root of 29887381 is about 310.3339481370. Note that the first 3 decimals are identical.

The spelling of 29887381 in words is "twenty-nine million, eight hundred eighty-seven thousand, three hundred eighty-one".