30945990 has 16 divisors (see below), whose sum is σ = 74270448. Its totient is φ = 8252256.

The previous prime is 30945983. The next prime is 30945991. The reversal of 30945990 is 9954903.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30945991) 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, 515737 + ... + 515796.

It is an arithmetic number, because the mean of its divisors is an integer number (4641903).

Almost surely, 2^30945990 is an apocalyptic number.

30945990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

30945990 is an abundant number, since it is smaller than the sum of its proper divisors (43324458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30945990 is a wasteful number, since it uses less digits than its factorization.

30945990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031543.

The product of its (nonzero) digits is 43740, while the sum is 39.

The square root of 30945990 is about 5562.9120072135. The cubic root of 30945990 is about 313.9555226601.

The spelling of 30945990 in words is "thirty million, nine hundred forty-five thousand, nine hundred ninety".