30181990 has 16 divisors (see below), whose sum is σ = 55484352. Its totient is φ = 11815744.

The previous prime is 30181969. The next prime is 30181999. The reversal of 30181990 is 9918103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30181999) 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, 31639 + ... + 32578.

It is an arithmetic number, because the mean of its divisors is an integer number (3467772).

Almost surely, 2^30181990 is an apocalyptic number.

30181990 is a deficient number, since it is larger than the sum of its proper divisors (25302362).

30181990 is a wasteful number, since it uses less digits than its factorization.

30181990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64271.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 30181990 is about 5493.8137937138. The cubic root of 30181990 is about 311.3503012709.

The spelling of 30181990 in words is "thirty million, one hundred eighty-one thousand, nine hundred ninety".