1215638047 has 8 divisors (see below), whose sum is σ = 1322646416. Its totient is φ = 1110557952.

The previous prime is 1215638041. The next prime is 1215638089. The reversal of 1215638047 is 7408365121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215638047 is a prime.

It is a super-2 number, since 2×1215638047² = 2955551722627948418, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1215637997 and 1215638015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215638041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 480753 + ... + 483274.

It is an arithmetic number, because the mean of its divisors is an integer number (165330802).

Almost surely, 2^1215638047 is an apocalyptic number.

1215638047 is a deficient number, since it is larger than the sum of its proper divisors (107008369).

1215638047 is an equidigital number, since it uses as much as digits as its factorization.

1215638047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964137.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 1215638047 is about 34866.0013049962. The cubic root of 1215638047 is about 1067.2547459112.

The spelling of 1215638047 in words is "one billion, two hundred fifteen million, six hundred thirty-eight thousand, forty-seven".