1380731687 has 8 divisors (see below), whose sum is σ = 1462355856. Its totient is φ = 1299152512.

The previous prime is 1380731669. The next prime is 1380731717. The reversal of 1380731687 is 7861370831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1380731687 - 2⁸ = 1380731431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1380731087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67913 + ... + 85869.

It is an arithmetic number, because the mean of its divisors is an integer number (182794482).

Almost surely, 2^1380731687 is an apocalyptic number.

1380731687 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1380731687 is a deficient number, since it is larger than the sum of its proper divisors (81624169).

1380731687 is a wasteful number, since it uses less digits than its factorization.

1380731687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22497.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 1380731687 is about 37158.1981129333. The cubic root of 1380731687 is about 1113.5330133457.

The spelling of 1380731687 in words is "one billion, three hundred eighty million, seven hundred thirty-one thousand, six hundred eighty-seven".