999997439 has 24 divisors (see below), whose sum is σ = 1180003968. Its totient is φ = 844890480.

The previous prime is 999997403. The next prime is 999997457. The reversal of 999997439 is 934799999.

It is a de Polignac number, because none of the positive numbers 2^k-999997439 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 (999997489) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1751024 + ... + 1751594.

It is an arithmetic number, because the mean of its divisors is an integer number (49166832).

Almost surely, 2^999997439 is an apocalyptic number.

999997439 is a deficient number, since it is larger than the sum of its proper divisors (180006529).

999997439 is a wasteful number, since it uses less digits than its factorization.

999997439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035 (or 1028 counting only the distinct ones).

The product of its digits is 44641044, while the sum is 68.

The square root of 999997439 is about 31622.7361086924. The cubic root of 999997439 is about 999.9991463326. Note that the first 3 decimals are identical.

The spelling of 999997439 in words is "nine hundred ninety-nine million, nine hundred ninety-seven thousand, four hundred thirty-nine".