29939440 has 40 divisors (see below), whose sum is σ = 73276560. Its totient is φ = 11344896.

The previous prime is 29939411. The next prime is 29939443. The reversal of 29939440 is 4493992.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 29939393 and 29939402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29939443) 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 in 7 ways as a sum of consecutive naturals, for example, 8329 + ... + 11368.

It is an arithmetic number, because the mean of its divisors is an integer number (1831914).

Almost surely, 2^29939440 is an apocalyptic number.

29939440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29939440 is an abundant number, since it is smaller than the sum of its proper divisors (43337120).

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

29939440 is a wasteful number, since it uses less digits than its factorization.

29939440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19729 (or 19723 counting only the distinct ones).

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

The square root of 29939440 is about 5471.6944359129. The cubic root of 29939440 is about 310.5140275254.

The spelling of 29939440 in words is "twenty-nine million, nine hundred thirty-nine thousand, four hundred forty".