18070919 has 4 divisors (see below), whose sum is σ = 19022040. Its totient is φ = 17119800.

The previous prime is 18070891. The next prime is 18070963. The reversal of 18070919 is 91907081.

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 18070919 - 2¹² = 18066823 is a prime.

It is a super-2 number, since 2×18070919² = 653116227009122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18070979) 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, 475532 + ... + 475569.

It is an arithmetic number, because the mean of its divisors is an integer number (4755510).

Almost surely, 2^18070919 is an apocalyptic number.

18070919 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18070919 is a deficient number, since it is larger than the sum of its proper divisors (951121).

18070919 is an equidigital number, since it uses as much as digits as its factorization.

18070919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951120.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 18070919 is about 4250.9903551996. The cubic root of 18070919 is about 262.4178742332.

The spelling of 18070919 in words is "eighteen million, seventy thousand, nine hundred nineteen".