29720869 has 4 divisors (see below), whose sum is σ = 30412096. Its totient is φ = 29029644.

The previous prime is 29720861. The next prime is 29720891. The reversal of 29720869 is 96802792.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 29720869 - 2³ = 29720861 is a prime.

It is a super-2 number, since 2×29720869² = 1766660108230322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 691183 = 29720869 / (2 + 9 + 7 + 2 + 0 + 8 + 6 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29720861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345549 + ... + 345634.

It is an arithmetic number, because the mean of its divisors is an integer number (7603024).

Almost surely, 2^29720869 is an apocalyptic number.

It is an amenable number.

29720869 is a deficient number, since it is larger than the sum of its proper divisors (691227).

29720869 is an equidigital number, since it uses as much as digits as its factorization.

29720869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691226.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 29720869 is about 5451.6849688881. The cubic root of 29720869 is about 309.7565518422.

The spelling of 29720869 in words is "twenty-nine million, seven hundred twenty thousand, eight hundred sixty-nine".