1381874345 has 4 divisors (see below), whose sum is σ = 1658249220. Its totient is φ = 1105499472.

The previous prime is 1381874311. The next prime is 1381874363. The reversal of 1381874345 is 5434781831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5434781831 = 19 ⋅286041149.

It can be written as a sum of positive squares in 2 ways, for example, as 723233449 + 658640896 = 26893^2 + 25664^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381874345 - 2⁶ = 1381874281 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1381874296 and 1381874305.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138187430 + ... + 138187439.

It is an arithmetic number, because the mean of its divisors is an integer number (414562305).

Almost surely, 2^1381874345 is an apocalyptic number.

It is an amenable number.

1381874345 is a deficient number, since it is larger than the sum of its proper divisors (276374875).

1381874345 is an equidigital number, since it uses as much as digits as its factorization.

1381874345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276374874.

The product of its digits is 322560, while the sum is 44.

The square root of 1381874345 is about 37173.5705172371. The cubic root of 1381874345 is about 1113.8401057328.

The spelling of 1381874345 in words is "one billion, three hundred eighty-one million, eight hundred seventy-four thousand, three hundred forty-five".