1024639 has 12 divisors (see below), whose sum is σ = 1300968. Its totient is φ = 798000.

The previous prime is 1024633. The next prime is 1024663. The reversal of 1024639 is 9364201.

It is not a de Polignac number, because 1024639 - 2⁷ = 1024511 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 (1024633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 412 + ... + 1489.

It is an arithmetic number, because the mean of its divisors is an integer number (108414).

2^1024639 is an apocalyptic number.

1024639 is a deficient number, since it is larger than the sum of its proper divisors (276329).

1024639 is a wasteful number, since it uses less digits than its factorization.

1024639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1926 (or 1919 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1024639 is about 1012.2445356731. The cubic root of 1024639 is about 100.8146455058.

It can be divided in two parts, 10 and 24639, that added together give a square (24649 = 157²).

The spelling of 1024639 in words is "one million, twenty-four thousand, six hundred thirty-nine".