1215412405 has 32 divisors (see below), whose sum is σ = 1525331808. Its totient is φ = 928972800.

The previous prime is 1215412397. The next prime is 1215412421. The reversal of 1215412405 is 5042145121.

It can be written as a sum of positive squares in 16 ways, for example, as 503643364 + 711769041 = 22442^2 + 26679^2 .

It is not a de Polignac number, because 1215412405 - 2³ = 1215412397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1215412405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3606397 + ... + 3606733.

It is an arithmetic number, because the mean of its divisors is an integer number (47666619).

Almost surely, 2^1215412405 is an apocalyptic number.

It is an amenable number.

1215412405 is a deficient number, since it is larger than the sum of its proper divisors (309919403).

1215412405 is a wasteful number, since it uses less digits than its factorization.

1215412405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 1215412405 is about 34862.7653091375. The cubic root of 1215412405 is about 1067.1887086020.

Adding to 1215412405 its reverse (5042145121), we get a palindrome (6257557526).

The spelling of 1215412405 in words is "one billion, two hundred fifteen million, four hundred twelve thousand, four hundred five".