1215740 has 24 divisors (see below), whose sum is σ = 2585520. Its totient is φ = 480128.

The previous prime is 1215719. The next prime is 1215743. The reversal of 1215740 is 475121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215743) 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, 1439 + ... + 2121.

It is an arithmetic number, because the mean of its divisors is an integer number (107730).

2^1215740 is an apocalyptic number.

1215740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215740 is an abundant number, since it is smaller than the sum of its proper divisors (1369780).

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

1215740 is a wasteful number, since it uses less digits than its factorization.

1215740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781 (or 779 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 1215740 is about 1102.6060039742. The cubic root of 1215740 is about 106.7284581212.

Adding to 1215740 its product of nonzero digits (280), we get a triangular number (1216020 = T₁₅₅₉).

The spelling of 1215740 in words is "one million, two hundred fifteen thousand, seven hundred forty".