1647021142 has 8 divisors (see below), whose sum is σ = 2660572656. Its totient is φ = 760163592.

The previous prime is 1647021139. The next prime is 1647021161. The reversal of 1647021142 is 2411207461.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1647021142.

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, 31673458 + ... + 31673509.

It is an arithmetic number, because the mean of its divisors is an integer number (332571582).

Almost surely, 2^1647021142 is an apocalyptic number.

1647021142 is a deficient number, since it is larger than the sum of its proper divisors (1013551514).

1647021142 is a wasteful number, since it uses less digits than its factorization.

1647021142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63346982.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 1647021142 is about 40583.5082515053. The cubic root of 1647021142 is about 1180.9542080616.

The spelling of 1647021142 in words is "one billion, six hundred forty-seven million, twenty-one thousand, one hundred forty-two".