30897999 has 12 divisors (see below), whose sum is σ = 48687912. Its totient is φ = 18726000.

The previous prime is 30897991. The next prime is 30898013. The reversal of 30897999 is 99979803.

It is a happy number.

It is not a de Polignac number, because 30897999 - 2³ = 30897991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30897991) 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, 155952 + ... + 156149.

It is an arithmetic number, because the mean of its divisors is an integer number (4057326).

Almost surely, 2^30897999 is an apocalyptic number.

30897999 is a deficient number, since it is larger than the sum of its proper divisors (17789913).

30897999 is a wasteful number, since it uses less digits than its factorization.

30897999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312118 (or 312115 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 54.

The square root of 30897999 is about 5558.5968553224. The cubic root of 30897999 is about 313.7931447575.

The spelling of 30897999 in words is "thirty million, eight hundred ninety-seven thousand, nine hundred ninety-nine".