1215706420 has 12 divisors (see below), whose sum is σ = 2552983524. Its totient is φ = 486282560.

The previous prime is 1215706391. The next prime is 1215706439. The reversal of 1215706420 is 246075121.

It can be written as a sum of positive squares in 2 ways, for example, as 203575824 + 1012130596 = 14268^2 + 31814^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30392641 + ... + 30392680.

It is an arithmetic number, because the mean of its divisors is an integer number (212748627).

Almost surely, 2^1215706420 is an apocalyptic number.

1215706420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215706420 is an abundant number, since it is smaller than the sum of its proper divisors (1337277104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1215706420 is a wasteful number, since it uses less digits than its factorization.

1215706420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60785330 (or 60785328 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 1215706420 is about 34866.9818022725. The cubic root of 1215706420 is about 1067.2747546193.

The spelling of 1215706420 in words is "one billion, two hundred fifteen million, seven hundred six thousand, four hundred twenty".