1215755 has 8 divisors (see below), whose sum is σ = 1544832. Its totient is φ = 915328.

The previous prime is 1215743. The next prime is 1215769. The reversal of 1215755 is 5575121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1215755 - 2⁸ = 1215499 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7067 + ... + 7236.

It is an arithmetic number, because the mean of its divisors is an integer number (193104).

2^1215755 is an apocalyptic number.

1215755 is a deficient number, since it is larger than the sum of its proper divisors (329077).

1215755 is a wasteful number, since it uses less digits than its factorization.

1215755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14325.

The product of its digits is 1750, while the sum is 26.

The square root of 1215755 is about 1102.6128060203. The cubic root of 1215755 is about 106.7288970638.

The spelling of 1215755 in words is "one million, two hundred fifteen thousand, seven hundred fifty-five".