1215045 has 48 divisors (see below), whose sum is σ = 2376192. Its totient is φ = 570240.

The previous prime is 1215029. The next prime is 1215047. The reversal of 1215045 is 5405121.

It is not a de Polignac number, because 1215045 - 2⁴ = 1215029 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215047) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18102 + ... + 18168.

It is an arithmetic number, because the mean of its divisors is an integer number (49504).

2^1215045 is an apocalyptic number.

1215045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1215045 is a deficient number, since it is larger than the sum of its proper divisors (1161147).

1215045 is a wasteful number, since it uses less digits than its factorization.

1215045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 1215045 is about 1102.2907964780. The cubic root of 1215045 is about 106.7081164863.

The spelling of 1215045 in words is "one million, two hundred fifteen thousand, forty-five".