1401216615 has 24 divisors (see below), whose sum is σ = 2488017168. Its totient is φ = 729087360.

The previous prime is 1401216613. The next prime is 1401216667. The reversal of 1401216615 is 5166121041.

1401216615 is a `hidden beast` number, since 1 + 40 + 1 + 2 + 1 + 6 + 615 = 666.

It is not a de Polignac number, because 1401216615 - 2¹ = 1401216613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1401216613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 377889 + ... + 381578.

It is an arithmetic number, because the mean of its divisors is an integer number (103667382).

Almost surely, 2^1401216615 is an apocalyptic number.

1401216615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1401216615 is a deficient number, since it is larger than the sum of its proper divisors (1086800553).

1401216615 is a wasteful number, since it uses less digits than its factorization.

1401216615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759519 (or 759516 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1401216615 is about 37432.8280390355. The cubic root of 1401216615 is about 1119.0128991510.

Adding to 1401216615 its reverse (5166121041), we get a palindrome (6567337656).

The spelling of 1401216615 in words is "one billion, four hundred one million, two hundred sixteen thousand, six hundred fifteen".