1214623440 has 120 divisors (see below), whose sum is σ = 4115484360. Its totient is φ = 321011712.

The previous prime is 1214623439. The next prime is 1214623453. The reversal of 1214623440 is 443264121.

It is a happy number.

1214623440 is a `hidden beast` number, since 1 + 214 + 6 + 2 + 3 + 440 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 47444544 + 1167178896 = 6888^2 + 34164^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73896 + ... + 88824.

It is an arithmetic number, because the mean of its divisors is an integer number (34295703).

Almost surely, 2^1214623440 is an apocalyptic number.

1214623440 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 1214623440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2057742180).

1214623440 is an abundant number, since it is smaller than the sum of its proper divisors (2900860920).

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

1214623440 is a wasteful number, since it uses less digits than its factorization.

1214623440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15061 (or 15052 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 1214623440 is about 34851.4481765105. The cubic root of 1214623440 is about 1066.9577426115.

Adding to 1214623440 its reverse (443264121), we get a palindrome (1657887561).

The spelling of 1214623440 in words is "one billion, two hundred fourteen million, six hundred twenty-three thousand, four hundred forty".