1838642545 has 8 divisors (see below), whose sum is σ = 2231162280. Its totient is φ = 1454386560.

The previous prime is 1838642539. The next prime is 1838642551. The reversal of 1838642545 is 5452468381.

It is an interprime number because it is at equal distance from previous prime (1838642539) and next prime (1838642551).

It can be written as a sum of positive squares in 4 ways, for example, as 7144929 + 1831497616 = 2673^2 + 42796^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1838642545 - 2³ = 1838642537 is a prime.

It is a super-3 number, since 3×1838642545³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1838642495 and 1838642504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2065446 + ... + 2066335.

It is an arithmetic number, because the mean of its divisors is an integer number (278895285).

Almost surely, 2^1838642545 is an apocalyptic number.

It is an amenable number.

1838642545 is a deficient number, since it is larger than the sum of its proper divisors (392519735).

1838642545 is an equidigital number, since it uses as much as digits as its factorization.

1838642545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4131875.

The product of its digits is 921600, while the sum is 46.

The square root of 1838642545 is about 42879.3953432182. The cubic root of 1838642545 is about 1225.0837193928.

The spelling of 1838642545 in words is "one billion, eight hundred thirty-eight million, six hundred forty-two thousand, five hundred forty-five".