1239640 has 32 divisors (see below), whose sum is σ = 2954880. Its totient is φ = 466432.

The previous prime is 1239619. The next prime is 1239643. The reversal of 1239640 is 469321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1239643) 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, 232 + ... + 1591.

It is an arithmetic number, because the mean of its divisors is an integer number (92340).

2^1239640 is an apocalyptic number.

1239640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1239640 is an abundant number, since it is smaller than the sum of its proper divisors (1715240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1239640 is a wasteful number, since it uses less digits than its factorization.

1239640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851 (or 1847 counting only the distinct ones).

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

The square root of 1239640 is about 1113.3912160602. The cubic root of 1239640 is about 107.4233092822.

The spelling of 1239640 in words is "one million, two hundred thirty-nine thousand, six hundred forty".