1285387439 has 8 divisors (see below), whose sum is σ = 1469245728. Its totient is φ = 1101587040.

The previous prime is 1285387423. The next prime is 1285387457. The reversal of 1285387439 is 9347835821.

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

It is a cyclic number.

It is not a de Polignac number, because 1285387439 - 2⁴ = 1285387423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285387489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56009 + ... + 75549.

It is an arithmetic number, because the mean of its divisors is an integer number (183655716).

Almost surely, 2^1285387439 is an apocalyptic number.

1285387439 is a deficient number, since it is larger than the sum of its proper divisors (183858289).

1285387439 is an equidigital number, since it uses as much as digits as its factorization.

1285387439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28945.

The product of its digits is 1451520, while the sum is 50.

The square root of 1285387439 is about 35852.3003306622. The cubic root of 1285387439 is about 1087.2882227155.

The spelling of 1285387439 in words is "one billion, two hundred eighty-five million, three hundred eighty-seven thousand, four hundred thirty-nine".