29993805 has 12 divisors (see below), whose sum is σ = 51989340. Its totient is φ = 15996672.

The previous prime is 29993779. The next prime is 29993807. The reversal of 29993805 is 50839992.

It can be written as a sum of positive squares in 2 ways, for example, as 22524516 + 7469289 = 4746^2 + 2733^2 .

It is not a de Polignac number, because 29993805 - 2⁸ = 29993549 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 666529 = 29993805 / (2 + 9 + 9 + 9 + 3 + 8 + 0 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29993807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 333220 + ... + 333309.

It is an arithmetic number, because the mean of its divisors is an integer number (4332445).

Almost surely, 2^29993805 is an apocalyptic number.

It is an amenable number.

29993805 is a deficient number, since it is larger than the sum of its proper divisors (21995535).

29993805 is a wasteful number, since it uses less digits than its factorization.

29993805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666540 (or 666537 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The square root of 29993805 is about 5476.6600223129. The cubic root of 29993805 is about 310.7018610059.

The spelling of 29993805 in words is "twenty-nine million, nine hundred ninety-three thousand, eight hundred five".