1428739 has 4 divisors (see below), whose sum is σ = 1538656. Its totient is φ = 1318824.

The previous prime is 1428709. The next prime is 1428751. The reversal of 1428739 is 9378241.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-1428739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1428709) 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, 54939 + ... + 54964.

It is an arithmetic number, because the mean of its divisors is an integer number (384664).

2^1428739 is an apocalyptic number.

1428739 is a deficient number, since it is larger than the sum of its proper divisors (109917).

1428739 is a wasteful number, since it uses less digits than its factorization.

1428739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109916.

The product of its digits is 12096, while the sum is 34.

The square root of 1428739 is about 1195.2987074368. The cubic root of 1428739 is about 112.6291915014.

The spelling of 1428739 in words is "one million, four hundred twenty-eight thousand, seven hundred thirty-nine".