1380051639 has 6 divisors (see below), whose sum is σ = 1993407936. Its totient is φ = 920034420.

The previous prime is 1380051611. The next prime is 1380051649. The reversal of 1380051639 is 9361500831.

It is a happy number.

1380051639 is a `hidden beast` number, since 13 + 8 + 0 + 0 + 5 + 1 + 639 = 666.

It is not a de Polignac number, because 1380051639 - 2⁸ = 1380051383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1380051649) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 76669527 + ... + 76669544.

It is an arithmetic number, because the mean of its divisors is an integer number (332234656).

Almost surely, 2^1380051639 is an apocalyptic number.

1380051639 is a deficient number, since it is larger than the sum of its proper divisors (613356297).

1380051639 is a wasteful number, since it uses less digits than its factorization.

1380051639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153339077 (or 153339074 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 1380051639 is about 37149.0462730876. The cubic root of 1380051639 is about 1113.3501682009.

The spelling of 1380051639 in words is "one billion, three hundred eighty million, fifty-one thousand, six hundred thirty-nine".