29920891 has 32 divisors (see below), whose sum is σ = 40836096. Its totient is φ = 21168000.

The previous prime is 29920883. The next prime is 29920949. The reversal of 29920891 is 19802992.

29920891 = T₄₈₀ + T₄₈₁ + ... + T₆₆₁.

It is not a de Polignac number, because 29920891 - 2³ = 29920883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (29920841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70861 + ... + 71281.

It is an arithmetic number, because the mean of its divisors is an integer number (1276128).

Almost surely, 2^29920891 is an apocalyptic number.

29920891 is a deficient number, since it is larger than the sum of its proper divisors (10915205).

29920891 is a wasteful number, since it uses less digits than its factorization.

29920891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 29920891 is about 5469.9991773308. Note that the first 3 decimals coincide. The cubic root of 29920891 is about 310.4498878868.

The spelling of 29920891 in words is "twenty-nine million, nine hundred twenty thousand, eight hundred ninety-one".