18958019 has 4 divisors (see below), whose sum is σ = 19569600. Its totient is φ = 18346440.

The previous prime is 18958013. The next prime is 18958021. The reversal of 18958019 is 91085981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18958019 - 2¹² = 18953923 is a prime.

It is a super-2 number, since 2×18958019² = 718812968808722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18958013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305744 + ... + 305805.

It is an arithmetic number, because the mean of its divisors is an integer number (4892400).

Almost surely, 2^18958019 is an apocalyptic number.

18958019 is a deficient number, since it is larger than the sum of its proper divisors (611581).

18958019 is an equidigital number, since it uses as much as digits as its factorization.

18958019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611580.

The product of its (nonzero) digits is 25920, while the sum is 41.

The square root of 18958019 is about 4354.0807296145. The cubic root of 18958019 is about 266.6434898260.

The spelling of 18958019 in words is "eighteen million, nine hundred fifty-eight thousand, nineteen".