1390639443 has 8 divisors (see below), whose sum is σ = 1860880848. Its totient is φ = 923745504.

The previous prime is 1390639427. The next prime is 1390639477. The reversal of 1390639443 is 3449360931.

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

It is not a de Polignac number, because 1390639443 - 2⁴ = 1390639427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1390639395 and 1390639404.

It is not an unprimeable number, because it can be changed into a prime (1390639343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 835896 + ... + 837557.

It is an arithmetic number, because the mean of its divisors is an integer number (232610106).

Almost surely, 2^1390639443 is an apocalyptic number.

1390639443 is a deficient number, since it is larger than the sum of its proper divisors (470241405).

1390639443 is a wasteful number, since it uses less digits than its factorization.

1390639443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673733.

The product of its (nonzero) digits is 209952, while the sum is 42.

The square root of 1390639443 is about 37291.2783771219. The cubic root of 1390639443 is about 1116.1901381113.

The spelling of 1390639443 in words is "one billion, three hundred ninety million, six hundred thirty-nine thousand, four hundred forty-three".