30729497 has 4 divisors (see below), whose sum is σ = 30752100. Its totient is φ = 30706896.

The previous prime is 30729487. The next prime is 30729509. The reversal of 30729497 is 79492703.

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 17884441 + 12845056 = 4229^2 + 3584^2 .

It is a cyclic number.

It is not a de Polignac number, because 30729497 - 2⁴ = 30729481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30729427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9122 + ... + 12027.

It is an arithmetic number, because the mean of its divisors is an integer number (7688025).

Almost surely, 2^30729497 is an apocalyptic number.

It is an amenable number.

30729497 is a deficient number, since it is larger than the sum of its proper divisors (22603).

30729497 is a wasteful number, since it uses less digits than its factorization.

30729497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22602.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 30729497 is about 5543.4192516893. The cubic root of 30729497 is about 313.2216818381.

The spelling of 30729497 in words is "thirty million, seven hundred twenty-nine thousand, four hundred ninety-seven".