1215412642 has 8 divisors (see below), whose sum is σ = 1857517596. Its totient is φ = 596240112.

The previous prime is 1215412633. The next prime is 1215412643. The reversal of 1215412642 is 2462145121.

It can be written as a sum of positive squares in 2 ways, for example, as 1152670401 + 62742241 = 33951^2 + 7921^2 .

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 1215412642.

It is not an unprimeable number, because it can be changed into a prime (1215412643) 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, 5732973 + ... + 5733184.

Almost surely, 2^1215412642 is an apocalyptic number.

1215412642 is a deficient number, since it is larger than the sum of its proper divisors (642104954).

1215412642 is a wasteful number, since it uses less digits than its factorization.

1215412642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11466212.

The product of its digits is 3840, while the sum is 28.

The square root of 1215412642 is about 34862.7687081792. The cubic root of 1215412642 is about 1067.1887779677.

Adding to 1215412642 its reverse (2462145121), we get a palindrome (3677557763).

The spelling of 1215412642 in words is "one billion, two hundred fifteen million, four hundred twelve thousand, six hundred forty-two".