30221738 has 8 divisors (see below), whose sum is σ = 45401988. Its totient is φ = 15087744.

The previous prime is 30221729. The next prime is 30221753. The reversal of 30221738 is 83712203.

It can be written as a sum of positive squares in 2 ways, for example, as 27321529 + 2900209 = 5227^2 + 1703^2 .

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

It is a Curzon number.

It is an unprimeable number.

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, 9881 + ... + 12572.

Almost surely, 2^30221738 is an apocalyptic number.

30221738 is the 2939-th centered heptagonal number.

30221738 is a deficient number, since it is larger than the sum of its proper divisors (15180250).

30221738 is a wasteful number, since it uses less digits than its factorization.

30221738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23128.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 30221738 is about 5497.4301268866. The cubic root of 30221738 is about 311.4869183187.

It can be divided in two parts, 302 and 21738, that multiplied together give a triangular number (6564876 = T₃₆₂₃).

The spelling of 30221738 in words is "thirty million, two hundred twenty-one thousand, seven hundred thirty-eight".