29439940 has 24 divisors (see below), whose sum is σ = 61978392. Its totient is φ = 11746560.

The previous prime is 29439913. The next prime is 29439947. The reversal of 29439940 is 4993492.

It can be written as a sum of positive squares in 4 ways, for example, as 11343424 + 18096516 = 3368^2 + 4254^2 .

It is a junction number, because it is equal to n+sod(n) for n = 29439893 and 29439902.

It is not an unprimeable number, because it can be changed into a prime (29439947) 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, 7530 + ... + 10750.

It is an arithmetic number, because the mean of its divisors is an integer number (2582433).

Almost surely, 2^29439940 is an apocalyptic number.

29439940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29439940 is an abundant number, since it is smaller than the sum of its proper divisors (32538452).

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

29439940 is a wasteful number, since it uses less digits than its factorization.

29439940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3687 (or 3685 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 29439940 is about 5425.8584574240. The cubic root of 29439940 is about 308.7774954069. Note that the first 3 decimals are identical.

The spelling of 29439940 in words is "twenty-nine million, four hundred thirty-nine thousand, nine hundred forty".