18778045 has 16 divisors (see below), whose sum is σ = 26474112. Its totient is φ = 12605760.

The previous prime is 18778037. The next prime is 18778049. The reversal of 18778045 is 54087781.

It is not a de Polignac number, because 18778045 - 2³ = 18778037 is a prime.

It is a super-2 number, since 2×18778045² = 705229948044050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18777989 and 18778007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18778049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12417 + ... + 13846.

It is an arithmetic number, because the mean of its divisors is an integer number (1654632).

Almost surely, 2^18778045 is an apocalyptic number.

It is an amenable number.

18778045 is a deficient number, since it is larger than the sum of its proper divisors (7696067).

18778045 is a wasteful number, since it uses less digits than its factorization.

18778045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26292.

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 18778045 is about 4333.3641665570. The cubic root of 18778045 is about 265.7970307986.

The spelling of 18778045 in words is "eighteen million, seven hundred seventy-eight thousand, forty-five".