1389026971 has 8 divisors (see below), whose sum is σ = 1460002464. Its totient is φ = 1318933440.

The previous prime is 1389026957. The next prime is 1389026999. The reversal of 1389026971 is 1796209831.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1389026971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1389026941) 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, 217260 + ... + 223561.

It is an arithmetic number, because the mean of its divisors is an integer number (182500308).

Almost surely, 2^1389026971 is an apocalyptic number.

1389026971 is a deficient number, since it is larger than the sum of its proper divisors (70975493).

1389026971 is a wasteful number, since it uses less digits than its factorization.

1389026971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440981.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 1389026971 is about 37269.6521448752. The cubic root of 1389026971 is about 1115.7585569310.

The spelling of 1389026971 in words is "one billion, three hundred eighty-nine million, twenty-six thousand, nine hundred seventy-one".