1389401287 has 4 divisors (see below), whose sum is σ = 1389606856. Its totient is φ = 1389195720.

The previous prime is 1389401269. The next prime is 1389401303. The reversal of 1389401287 is 7821049831.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1389401287 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 (1389401257) 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, 92289 + ... + 106282.

It is an arithmetic number, because the mean of its divisors is an integer number (347401714).

Almost surely, 2^1389401287 is an apocalyptic number.

1389401287 is a deficient number, since it is larger than the sum of its proper divisors (205569).

1389401287 is an equidigital number, since it uses as much as digits as its factorization.

1389401287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205568.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 1389401287 is about 37274.6735331109. The cubic root of 1389401287 is about 1115.8587730724.

The spelling of 1389401287 in words is "one billion, three hundred eighty-nine million, four hundred one thousand, two hundred eighty-seven".