1639944542 has 8 divisors (see below), whose sum is σ = 2604617856. Its totient is φ = 771738592.

The previous prime is 1639944529. The next prime is 1639944563. The reversal of 1639944542 is 2454499361.

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

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, 24116798 + ... + 24116865.

It is an arithmetic number, because the mean of its divisors is an integer number (325577232).

Almost surely, 2^1639944542 is an apocalyptic number.

1639944542 is a deficient number, since it is larger than the sum of its proper divisors (964673314).

1639944542 is a wasteful number, since it uses less digits than its factorization.

1639944542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48233682.

The product of its digits is 933120, while the sum is 47.

The square root of 1639944542 is about 40496.2287379949. The cubic root of 1639944542 is about 1179.2604151285.

The spelling of 1639944542 in words is "one billion, six hundred thirty-nine million, nine hundred forty-four thousand, five hundred forty-two".