1389931 has 4 divisors (see below), whose sum is σ = 1419552. Its totient is φ = 1360312.

The previous prime is 1389919. The next prime is 1389943. The reversal of 1389931 is 1399831.

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

It is an interprime number because it is at equal distance from previous prime (1389919) and next prime (1389943).

It is a cyclic number.

It is not a de Polignac number, because 1389931 - 2¹³ = 1381739 is a prime.

It is a super-2 number, since 2×1389931² = 3863816369522, which contains 22 as substring.

It is a Duffinian number.

1389931 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1389911) 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, 14740 + ... + 14833.

It is an arithmetic number, because the mean of its divisors is an integer number (354888).

2^1389931 is an apocalyptic number.

1389931 is a deficient number, since it is larger than the sum of its proper divisors (29621).

1389931 is an equidigital number, since it uses as much as digits as its factorization.

1389931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29620.

The product of its digits is 5832, while the sum is 34.

The square root of 1389931 is about 1178.9533493739. The cubic root of 1389931 is about 111.6000563113.

The spelling of 1389931 in words is "one million, three hundred eighty-nine thousand, nine hundred thirty-one".