1216240 has 40 divisors (see below), whose sum is σ = 2955168. Its totient is φ = 464640.

The previous prime is 1216213. The next prime is 1216249. The reversal of 1216240 is 426121.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216249) 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, 1510 + ... + 2170.

2^1216240 is an apocalyptic number.

1216240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1477584).

1216240 is an abundant number, since it is smaller than the sum of its proper divisors (1738928).

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

1216240 is a wasteful number, since it uses less digits than its factorization.

1216240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697 (or 691 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1216240 is about 1102.8327162358. The cubic root of 1216240 is about 106.7430875965.

The spelling of 1216240 in words is "one million, two hundred sixteen thousand, two hundred forty".