1215439971 has 16 divisors (see below), whose sum is σ = 1676129280. Its totient is φ = 782624160.

The previous prime is 1215439963. The next prime is 1215439993. The reversal of 1215439971 is 1799345121.

It is not a de Polignac number, because 1215439971 - 2³ = 1215439963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1215432971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36145 + ... + 61133.

It is an arithmetic number, because the mean of its divisors is an integer number (104758080).

Almost surely, 2^1215439971 is an apocalyptic number.

1215439971 is a deficient number, since it is larger than the sum of its proper divisors (460689309).

1215439971 is a wasteful number, since it uses less digits than its factorization.

1215439971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25546.

The product of its digits is 68040, while the sum is 42.

The square root of 1215439971 is about 34863.1606570603. The cubic root of 1215439971 is about 1067.1967766183.

It can be divided in two parts, 12154 and 39971, that added together give a palindrome (52125).

The spelling of 1215439971 in words is "one billion, two hundred fifteen million, four hundred thirty-nine thousand, nine hundred seventy-one".