1238640 has 80 divisors (see below), whose sum is σ = 4145568. Its totient is φ = 304128.

The previous prime is 1238621. The next prime is 1238647. The reversal of 1238640 is 468321.

It is a happy number.

1238640 is nontrivially palindromic in base 11.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a zygodrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 1238640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1238647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2922 + ... + 3318.

2^1238640 is an apocalyptic number.

1238640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1238640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2072784).

1238640 is an abundant number, since it is smaller than the sum of its proper divisors (2906928).

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

1238640 is a wasteful number, since it uses less digits than its factorization.

1238640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1238640 is about 1112.9420470087. The cubic root of 1238640 is about 107.3944158917.

The spelling of 1238640 in words is "one million, two hundred thirty-eight thousand, six hundred forty".