1240390 has 16 divisors (see below), whose sum is σ = 2330208. Its totient is φ = 474496.

The previous prime is 1240387. The next prime is 1240391. The reversal of 1240390 is 930421.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240391) 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 7 ways as a sum of consecutive naturals, for example, 2467 + ... + 2926.

It is an arithmetic number, because the mean of its divisors is an integer number (145638).

2^1240390 is an apocalyptic number.

1240390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1240390 is a deficient number, since it is larger than the sum of its proper divisors (1089818).

1240390 is a wasteful number, since it uses less digits than its factorization.

1240390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5423.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1240390 is about 1113.7279739685. The cubic root of 1240390 is about 107.4449691295. Note that the first 3 decimals are identical.

The spelling of 1240390 in words is "one million, two hundred forty thousand, three hundred ninety".