29986840 has 32 divisors (see below), whose sum is σ = 72661680. Its totient is φ = 11071872.

The previous prime is 29986823. The next prime is 29986849. The reversal of 29986840 is 4868992.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29986849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28314 + ... + 29353.

Almost surely, 2^29986840 is an apocalyptic number.

29986840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29986840 is an abundant number, since it is smaller than the sum of its proper divisors (42674840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

29986840 is a wasteful number, since it uses less digits than its factorization.

29986840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57691 (or 57687 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 29986840 is about 5476.0241051332. The cubic root of 29986840 is about 310.6778093060.

The spelling of 29986840 in words is "twenty-nine million, nine hundred eighty-six thousand, eight hundred forty".