30421990 has 16 divisors (see below), whose sum is σ = 55420848. Its totient is φ = 12021856.

The previous prime is 30421987. The next prime is 30421991. The reversal of 30421990 is 9912403.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30421991) 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 7 ways as a sum of consecutive naturals, for example, 17497 + ... + 19156.

It is an arithmetic number, because the mean of its divisors is an integer number (3463803).

Almost surely, 2^30421990 is an apocalyptic number.

30421990 is a deficient number, since it is larger than the sum of its proper divisors (24998858).

30421990 is a wasteful number, since it uses less digits than its factorization.

30421990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36743.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 30421990 is about 5515.6132931887. The cubic root of 30421990 is about 312.1733846172.

The spelling of 30421990 in words is "thirty million, four hundred twenty-one thousand, nine hundred ninety".