29921380 has 12 divisors (see below), whose sum is σ = 62834940. Its totient is φ = 11968544.

The previous prime is 29921363. The next prime is 29921393. The reversal of 29921380 is 8312992.

It can be written as a sum of positive squares in 2 ways, for example, as 4761124 + 25160256 = 2182^2 + 5016^2 .

It is a super-2 number, since 2×29921380² = 1790577962208800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 748015 + ... + 748054.

It is an arithmetic number, because the mean of its divisors is an integer number (5236245).

Almost surely, 2^29921380 is an apocalyptic number.

29921380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29921380 is an abundant number, since it is smaller than the sum of its proper divisors (32913560).

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

29921380 is a wasteful number, since it uses less digits than its factorization.

29921380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1496078 (or 1496076 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 29921380 is about 5470.0438755096. The cubic root of 29921380 is about 310.4515791151.

The spelling of 29921380 in words is "twenty-nine million, nine hundred twenty-one thousand, three hundred eighty".