1381862639 has 4 divisors (see below), whose sum is σ = 1382126424. Its totient is φ = 1381598856.

The previous prime is 1381862623. The next prime is 1381862641. The reversal of 1381862639 is 9362681831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1381862639 - 2⁴ = 1381862623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1381862593 and 1381862602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381867639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123872 + ... + 134565.

It is an arithmetic number, because the mean of its divisors is an integer number (345531606).

Almost surely, 2^1381862639 is an apocalyptic number.

1381862639 is a deficient number, since it is larger than the sum of its proper divisors (263785).

1381862639 is an equidigital number, since it uses as much as digits as its factorization.

1381862639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263784.

The product of its digits is 373248, while the sum is 47.

The square root of 1381862639 is about 37173.4130663301. The cubic root of 1381862639 is about 1113.8369605725.

The spelling of 1381862639 in words is "one billion, three hundred eighty-one million, eight hundred sixty-two thousand, six hundred thirty-nine".