1389890742 has 8 divisors (see below), whose sum is σ = 2779781496. Its totient is φ = 463296912.

The previous prime is 1389890741. The next prime is 1389890753. The reversal of 1389890742 is 2470989831.

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

1389890742 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389890741) 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, 115824223 + ... + 115824234.

It is an arithmetic number, because the mean of its divisors is an integer number (347472687).

Almost surely, 2^1389890742 is an apocalyptic number.

1389890742 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1389890742 is a wasteful number, since it uses less digits than its factorization.

1389890742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231648462.

The product of its (nonzero) digits is 870912, while the sum is 51.

The square root of 1389890742 is about 37281.2384719177. The cubic root of 1389890742 is about 1115.9897883856.

The spelling of 1389890742 in words is "one billion, three hundred eighty-nine million, eight hundred ninety thousand, seven hundred forty-two".