1215123 has 16 divisors (see below), whose sum is σ = 1994496. Its totient is φ = 640800.

The previous prime is 1215121. The next prime is 1215133. The reversal of 1215123 is 3215121.

It is not a de Polignac number, because 1215123 - 2¹ = 1215121 is a prime.

1215123 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1215121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1953 + ... + 2498.

It is an arithmetic number, because the mean of its divisors is an integer number (124656).

2^1215123 is an apocalyptic number.

1215123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1215123 is a deficient number, since it is larger than the sum of its proper divisors (779373).

1215123 is a wasteful number, since it uses less digits than its factorization.

1215123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4474.

The product of its digits is 60, while the sum is 15.

The square root of 1215123 is about 1102.3261767735. The cubic root of 1215123 is about 106.7103998188.

It can be divided in two parts, 12 and 15123, that multiplied together give a square (181476 = 426²).

The spelling of 1215123 in words is "one million, two hundred fifteen thousand, one hundred twenty-three".