29919940 has 24 divisors (see below), whose sum is σ = 63087192. Its totient is φ = 11919360.

The previous prime is 29919919. The next prime is 29919943. The reversal of 29919940 is 4991992.

It can be written as a sum of positive squares in 4 ways, for example, as 17189316 + 12730624 = 4146^2 + 3568^2 .

It is not an unprimeable number, because it can be changed into a prime (29919943) 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, 2230 + ... + 8050.

It is an arithmetic number, because the mean of its divisors is an integer number (2628633).

Almost surely, 2^29919940 is an apocalyptic number.

29919940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29919940 is an abundant number, since it is smaller than the sum of its proper divisors (33167252).

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

29919940 is a wasteful number, since it uses less digits than its factorization.

29919940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6087 (or 6085 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 29919940 is about 5469.9122479250. The cubic root of 29919940 is about 310.4465987583.

The spelling of 29919940 in words is "twenty-nine million, nine hundred nineteen thousand, nine hundred forty".