29439990 has 32 divisors (see below), whose sum is σ = 78507360. Its totient is φ = 7850592.

The previous prime is 29439989. The next prime is 29440007. The reversal of 29439990 is 9993492.

It is a super-2 number, since 2×29439990² = 1733426022400200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54249 + ... + 54788.

It is an arithmetic number, because the mean of its divisors is an integer number (2453355).

Almost surely, 2^29439990 is an apocalyptic number.

29439990 is an abundant number, since it is smaller than the sum of its proper divisors (49067370).

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

29439990 is a wasteful number, since it uses less digits than its factorization.

29439990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109053 (or 109047 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 29439990 is about 5425.8630649879. The cubic root of 29439990 is about 308.7776702132. Note that the first 3 decimals are identical.

The spelling of 29439990 in words is "twenty-nine million, four hundred thirty-nine thousand, nine hundred ninety".