1389420999 has 32 divisors (see below), whose sum is σ = 2294208000. Its totient is φ = 825904512.

The previous prime is 1389420971. The next prime is 1389421013. The reversal of 1389420999 is 9990249831.

It is not a de Polignac number, because 1389420999 - 2¹³ = 1389412807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389420959) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70939 + ... + 88380.

It is an arithmetic number, because the mean of its divisors is an integer number (71694000).

Almost surely, 2^1389420999 is an apocalyptic number.

1389420999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1389420999 is a deficient number, since it is larger than the sum of its proper divisors (904787001).

1389420999 is a wasteful number, since it uses less digits than its factorization.

1389420999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159364 (or 159358 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The square root of 1389420999 is about 37274.9379476345. The cubic root of 1389420999 is about 1115.8640500945.

The spelling of 1389420999 in words is "one billion, three hundred eighty-nine million, four hundred twenty thousand, nine hundred ninety-nine".