1389401288 has 32 divisors (see below), whose sum is σ = 2845566720. Its totient is φ = 630744000.

The previous prime is 1389401269. The next prime is 1389401303. The reversal of 1389401288 is 8821049831.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62633 + ... + 81863.

It is an arithmetic number, because the mean of its divisors is an integer number (88923960).

Almost surely, 2^1389401288 is an apocalyptic number.

It is an amenable number.

1389401288 is an abundant number, since it is smaller than the sum of its proper divisors (1456165432).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1389401288 is a wasteful number, since it uses less digits than its factorization.

1389401288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20069 (or 20065 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 1389401288 is about 37274.6735465249. The cubic root of 1389401288 is about 1115.8587733401.

The spelling of 1389401288 in words is "one billion, three hundred eighty-nine million, four hundred one thousand, two hundred eighty-eight".