1215975 has 24 divisors (see below), whose sum is σ = 2079232. Its totient is φ = 626400.

The previous prime is 1215923. The next prime is 1216009. The reversal of 1215975 is 5795121.

It is not a de Polignac number, because 1215975 - 2⁷ = 1215847 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2064 + ... + 2586.

2^1215975 is an apocalyptic number.

1215975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1215975 is a deficient number, since it is larger than the sum of its proper divisors (863257).

1215975 is a wasteful number, since it uses less digits than its factorization.

1215975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567 (or 562 counting only the distinct ones).

The product of its digits is 3150, while the sum is 30.

The square root of 1215975 is about 1102.7125645425. The cubic root of 1215975 is about 106.7353344741.

It can be divided in two parts, 12159 and 75, that multiplied together give a triangular number (911925 = T₁₃₅₀).

The spelling of 1215975 in words is "one million, two hundred fifteen thousand, nine hundred seventy-five".