30689999 has 4 divisors (see below), whose sum is σ = 31078560. Its totient is φ = 30301440.

The previous prime is 30689987. The next prime is 30690001. The reversal of 30689999 is 99998603.

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

It is a cyclic number.

It is not a de Polignac number, because 30689999 - 2¹² = 30685903 is a prime.

It is a Duffinian number.

30689999 is a modest number, since divided by 9999 gives 3068 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 30689999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30689299) 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, 194162 + ... + 194319.

It is an arithmetic number, because the mean of its divisors is an integer number (7769640).

Almost surely, 2^30689999 is an apocalyptic number.

30689999 is a deficient number, since it is larger than the sum of its proper divisors (388561).

30689999 is an equidigital number, since it uses as much as digits as its factorization.

30689999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388560.

The product of its (nonzero) digits is 944784, while the sum is 53.

The square root of 30689999 is about 5539.8555035308. The cubic root of 30689999 is about 313.0874250101.

The spelling of 30689999 in words is "thirty million, six hundred eighty-nine thousand, nine hundred ninety-nine".