1389408556 has 6 divisors (see below), whose sum is σ = 2431464980. Its totient is φ = 694704276.

The previous prime is 1389408491. The next prime is 1389408557. The reversal of 1389408556 is 6558049831.

It is a super-2 number, since 2×1389408556² = 3860912270972010272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1389408557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173676066 + ... + 173676073.

Almost surely, 2^1389408556 is an apocalyptic number.

It is an amenable number.

1389408556 is a deficient number, since it is larger than the sum of its proper divisors (1042056424).

1389408556 is a wasteful number, since it uses less digits than its factorization.

1389408556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347352143 (or 347352141 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 49.

The square root of 1389408556 is about 37274.7710388676. The cubic root of 1389408556 is about 1115.8607190336.

The spelling of 1389408556 in words is "one billion, three hundred eighty-nine million, four hundred eight thousand, five hundred fifty-six".