1878321345 has 32 divisors (see below), whose sum is σ = 3069705600. Its totient is φ = 980457984.

The previous prime is 1878321343. The next prime is 1878321353. The reversal of 1878321345 is 5431238781.

It is not a de Polignac number, because 1878321345 - 2¹ = 1878321343 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1878321297 and 1878321306.

It is not an unprimeable number, because it can be changed into a prime (1878321343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 201651 + ... + 210759.

It is an arithmetic number, because the mean of its divisors is an integer number (95928300).

Almost surely, 2^1878321345 is an apocalyptic number.

1878321345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1878321345 is a deficient number, since it is larger than the sum of its proper divisors (1191384255).

1878321345 is a wasteful number, since it uses less digits than its factorization.

1878321345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9409.

The product of its digits is 161280, while the sum is 42.

The square root of 1878321345 is about 43339.6048089966. The cubic root of 1878321345 is about 1233.8337091069.

The spelling of 1878321345 in words is "one billion, eight hundred seventy-eight million, three hundred twenty-one thousand, three hundred forty-five".