1389991377 has 8 divisors (see below), whose sum is σ = 1854139264. Its totient is φ = 926252208.

The previous prime is 1389991367. The next prime is 1389991381. The reversal of 1389991377 is 7731999831.

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

It is not a de Polignac number, because 1389991377 - 2¹⁶ = 1389925841 is a prime.

It is a super-2 number, since 2×1389991377² = 3864152056268712258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1389991327) 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, 94153 + ... + 107910.

It is an arithmetic number, because the mean of its divisors is an integer number (231767408).

Almost surely, 2^1389991377 is an apocalyptic number.

It is an amenable number.

1389991377 is a deficient number, since it is larger than the sum of its proper divisors (464147887).

1389991377 is a wasteful number, since it uses less digits than its factorization.

1389991377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204359.

The product of its digits is 2571912, while the sum is 57.

The square root of 1389991377 is about 37282.5881209983. The cubic root of 1389991377 is about 1116.0167221387.

The spelling of 1389991377 in words is "one billion, three hundred eighty-nine million, nine hundred ninety-one thousand, three hundred seventy-seven".