1380634187 has 4 divisors (see below), whose sum is σ = 1384239360. Its totient is φ = 1377029016.

The previous prime is 1380634163. The next prime is 1380634193. The reversal of 1380634187 is 7814360831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7814360831 = 19 ⋅411282149.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1380634187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1380633187) 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, 1802012 + ... + 1802777.

It is an arithmetic number, because the mean of its divisors is an integer number (346059840).

Almost surely, 2^1380634187 is an apocalyptic number.

1380634187 is a deficient number, since it is larger than the sum of its proper divisors (3605173).

1380634187 is an equidigital number, since it uses as much as digits as its factorization.

1380634187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3605172.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 1380634187 is about 37156.8861316446. The cubic root of 1380634187 is about 1113.5068021165.

The spelling of 1380634187 in words is "one billion, three hundred eighty million, six hundred thirty-four thousand, one hundred eighty-seven".