30157921 has 8 divisors (see below), whose sum is σ = 32484320. Its totient is φ = 27905472.

The previous prime is 30157913. The next prime is 30157927. The reversal of 30157921 is 12975103.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 30157921 - 2³ = 30157913 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30157921.

It is not an unprimeable number, because it can be changed into a prime (30157927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17640 + ... + 19273.

It is an arithmetic number, because the mean of its divisors is an integer number (4060540).

Almost surely, 2^30157921 is an apocalyptic number.

It is an amenable number.

30157921 is a deficient number, since it is larger than the sum of its proper divisors (2326399).

30157921 is a wasteful number, since it uses less digits than its factorization.

30157921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36975.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 30157921 is about 5491.6228020504. The cubic root of 30157921 is about 311.2675158823.

The spelling of 30157921 in words is "thirty million, one hundred fifty-seven thousand, nine hundred twenty-one".