30878421 has 8 divisors (see below), whose sum is σ = 47052864. Its totient is φ = 17644800.

The previous prime is 30878377. The next prime is 30878423. The reversal of 30878421 is 12487803.

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

It is not a de Polignac number, because 30878421 - 2¹⁴ = 30862037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30878423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 735180 + ... + 735221.

It is an arithmetic number, because the mean of its divisors is an integer number (5881608).

Almost surely, 2^30878421 is an apocalyptic number.

It is an amenable number.

30878421 is a deficient number, since it is larger than the sum of its proper divisors (16174443).

30878421 is a wasteful number, since it uses less digits than its factorization.

30878421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1470411.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 30878421 is about 5556.8355203299. The cubic root of 30878421 is about 313.7268541625.

The spelling of 30878421 in words is "thirty million, eight hundred seventy-eight thousand, four hundred twenty-one".