1238840 has 16 divisors (see below), whose sum is σ = 2787480. Its totient is φ = 495520.

The previous prime is 1238833. The next prime is 1238843. The reversal of 1238840 is 488321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1238843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15446 + ... + 15525.

2^1238840 is an apocalyptic number.

1238840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1238840 is an abundant number, since it is smaller than the sum of its proper divisors (1548640).

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

1238840 is a wasteful number, since it uses less digits than its factorization.

1238840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30982 (or 30978 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 1238840 is about 1113.0318953202. The cubic root of 1238840 is about 107.4001958136.

The spelling of 1238840 in words is "one million, two hundred thirty-eight thousand, eight hundred forty".