1381864245 has 16 divisors (see below), whose sum is σ = 2213669760. Its totient is φ = 736098624.

The previous prime is 1381864241. The next prime is 1381864273. The reversal of 1381864245 is 5424681831.

It is a happy number.

It is not a de Polignac number, because 1381864245 - 2² = 1381864241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1381864197 and 1381864206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381864241) 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, 43129 + ... + 67998.

It is an arithmetic number, because the mean of its divisors is an integer number (138354360).

Almost surely, 2^1381864245 is an apocalyptic number.

1381864245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1381864245 is a deficient number, since it is larger than the sum of its proper divisors (831805515).

1381864245 is a wasteful number, since it uses less digits than its factorization.

1381864245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111964.

The product of its digits is 184320, while the sum is 42.

The square root of 1381864245 is about 37173.4346677839. The cubic root of 1381864245 is about 1113.8373920725.

The spelling of 1381864245 in words is "one billion, three hundred eighty-one million, eight hundred sixty-four thousand, two hundred forty-five".