1387630289 has 4 divisors (see below), whose sum is σ = 1387803456. Its totient is φ = 1387457124.

The previous prime is 1387630267. The next prime is 1387630291. The reversal of 1387630289 is 9820367831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1387630289 - 2⁸ = 1387630033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1387638289) 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, 73949 + ... + 90794.

It is an arithmetic number, because the mean of its divisors is an integer number (346950864).

Almost surely, 2^1387630289 is an apocalyptic number.

It is an amenable number.

1387630289 is a deficient number, since it is larger than the sum of its proper divisors (173167).

1387630289 is an equidigital number, since it uses as much as digits as its factorization.

1387630289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173166.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 1387630289 is about 37250.9099083499. The cubic root of 1387630289 is about 1115.3844623230.

The spelling of 1387630289 in words is "one billion, three hundred eighty-seven million, six hundred thirty thousand, two hundred eighty-nine".