30899905 has 4 divisors (see below), whose sum is σ = 37079892. Its totient is φ = 24719920.

The previous prime is 30899903. The next prime is 30899923. The reversal of 30899905 is 50999803.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15713296 + 15186609 = 3964^2 + 3897^2 .

It is not a de Polignac number, because 30899905 - 2¹ = 30899903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30899903) 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, 3089986 + ... + 3089995.

It is an arithmetic number, because the mean of its divisors is an integer number (9269973).

Almost surely, 2^30899905 is an apocalyptic number.

It is an amenable number.

30899905 is a deficient number, since it is larger than the sum of its proper divisors (6179987).

30899905 is an equidigital number, since it uses as much as digits as its factorization.

30899905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6179986.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 30899905 is about 5558.7682988230. The cubic root of 30899905 is about 313.7995969276.

The spelling of 30899905 in words is "thirty million, eight hundred ninety-nine thousand, nine hundred five".