1643952542 has 16 divisors (see below), whose sum is σ = 2597086800. Its totient is φ = 778302720.

The previous prime is 1643952487. The next prime is 1643952593. The reversal of 1643952542 is 2452593461.

It is a self number, because there is not a number n which added to its sum of digits gives 1643952542.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68684 + ... + 89472.

It is an arithmetic number, because the mean of its divisors is an integer number (162317925).

Almost surely, 2^1643952542 is an apocalyptic number.

1643952542 is a deficient number, since it is larger than the sum of its proper divisors (953134258).

1643952542 is a wasteful number, since it uses less digits than its factorization.

1643952542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22891.

The product of its digits is 259200, while the sum is 41.

The square root of 1643952542 is about 40545.6846285767. The cubic root of 1643952542 is about 1180.2203318338.

The spelling of 1643952542 in words is "one billion, six hundred forty-three million, nine hundred fifty-two thousand, five hundred forty-two".