1215550 has 48 divisors (see below), whose sum is σ = 2714112. Its totient is φ = 396000.

The previous prime is 1215521. The next prime is 1215553. The reversal of 1215550 is 555121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7975 + ... + 8125.

It is an arithmetic number, because the mean of its divisors is an integer number (56544).

2^1215550 is an apocalyptic number.

1215550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1215550 is an abundant number, since it is smaller than the sum of its proper divisors (1498562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1215550 is a wasteful number, since it uses less digits than its factorization.

1215550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 19.

The square root of 1215550 is about 1102.5198410913. The cubic root of 1215550 is about 106.7228978689.

It can be divided in two parts, 121 and 5550, that added together give a triangular number (5671 = T₁₀₆).

The spelling of 1215550 in words is "one million, two hundred fifteen thousand, five hundred fifty".