1215801442 has 8 divisors (see below), whose sum is σ = 1834244316. Its totient is φ = 604386672.

The previous prime is 1215801439. The next prime is 1215801443. The reversal of 1215801442 is 2441085121.

It can be written as a sum of positive squares in 2 ways, for example, as 1160015481 + 55785961 = 34059^2 + 7469^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1215801442.

It is not an unprimeable number, because it can be changed into a prime (1215801443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1756593 + ... + 1757284.

Almost surely, 2^1215801442 is an apocalyptic number.

1215801442 is a deficient number, since it is larger than the sum of its proper divisors (618442874).

1215801442 is a wasteful number, since it uses less digits than its factorization.

1215801442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3514052.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 1215801442 is about 34868.3444115146. The cubic root of 1215801442 is about 1067.3025606581.

Adding to 1215801442 its reverse (2441085121), we get a palindrome (3656886563).

The spelling of 1215801442 in words is "one billion, two hundred fifteen million, eight hundred one thousand, four hundred forty-two".