30019919 has 6 divisors (see below), whose sum is σ = 30300816. Its totient is φ = 29741600.

The previous prime is 30019903. The next prime is 30019931. The reversal of 30019919 is 91991003.

It is not a de Polignac number, because 30019919 - 2⁴ = 30019903 is a prime.

It is a super-2 number, since 2×30019919² = 1802391073533122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30019219) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11594 + ... + 13944.

It is an arithmetic number, because the mean of its divisors is an integer number (5050136).

Almost surely, 2^30019919 is an apocalyptic number.

30019919 is a deficient number, since it is larger than the sum of its proper divisors (280897).

30019919 is an equidigital number, since it uses as much as digits as its factorization.

30019919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2577 (or 2464 counting only the distinct ones).

The product of its (nonzero) digits is 2187, while the sum is 32.

The square root of 30019919 is about 5479.0436209251. The cubic root of 30019919 is about 310.7920053410.

The spelling of 30019919 in words is "thirty million, nineteen thousand, nine hundred nineteen".