1215841 has 8 divisors (see below), whose sum is σ = 1340064. Its totient is φ = 1093920.

The previous prime is 1215839. The next prime is 1215847. The reversal of 1215841 is 1485121.

1215841 = T₁₅₈ + T₁₅₉ + ... + T₂₂₃.

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 1215841 - 2¹ = 1215839 is a prime.

It is an Ulam number.

1215841 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1215847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 661 + ... + 1693.

It is an arithmetic number, because the mean of its divisors is an integer number (167508).

2^1215841 is an apocalyptic number.

1215841 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1215841 is a deficient number, since it is larger than the sum of its proper divisors (124223).

1215841 is a wasteful number, since it uses less digits than its factorization.

1215841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151.

The product of its digits is 320, while the sum is 22.

The square root of 1215841 is about 1102.6518036080. The cubic root of 1215841 is about 106.7314135985.

The spelling of 1215841 in words is "one million, two hundred fifteen thousand, eight hundred forty-one".