1426639 has 4 divisors (see below), whose sum is σ = 1446256. Its totient is φ = 1407024.

The previous prime is 1426627. The next prime is 1426643. The reversal of 1426639 is 9366241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9366241 = 337 ⋅27793.

It is a cyclic number.

It is not a de Polignac number, because 1426639 - 2⁷ = 1426511 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1426639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1426619) 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, 9699 + ... + 9844.

It is an arithmetic number, because the mean of its divisors is an integer number (361564).

2^1426639 is an apocalyptic number.

1426639 is a deficient number, since it is larger than the sum of its proper divisors (19617).

1426639 is an equidigital number, since it uses as much as digits as its factorization.

1426639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19616.

The product of its digits is 7776, while the sum is 31.

The square root of 1426639 is about 1194.4199429012. The cubic root of 1426639 is about 112.5739826124.

The spelling of 1426639 in words is "one million, four hundred twenty-six thousand, six hundred thirty-nine".