1372879666 has 8 divisors (see below), whose sum is σ = 2064355740. Its totient is φ = 684761088.

The previous prime is 1372879663. The next prime is 1372879721. The reversal of 1372879666 is 6669782731.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1195430625 + 177449041 = 34575^2 + 13321^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1372879663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 838351 + ... + 839986.

Almost surely, 2^1372879666 is an apocalyptic number.

1372879666 is a deficient number, since it is larger than the sum of its proper divisors (691476074).

1372879666 is a wasteful number, since it uses less digits than its factorization.

1372879666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1678748.

The product of its digits is 4572288, while the sum is 55.

The square root of 1372879666 is about 37052.3908270438. The cubic root of 1372879666 is about 1111.4181656987.

The spelling of 1372879666 in words is "one billion, three hundred seventy-two million, eight hundred seventy-nine thousand, six hundred sixty-six".