19939057 has 8 divisors (see below), whose sum is σ = 20465280. Its totient is φ = 19415760.

The previous prime is 19939033. The next prime is 19939061. The reversal of 19939057 is 75093991.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19939057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19939027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21432 + ... + 22342.

It is an arithmetic number, because the mean of its divisors is an integer number (2558160).

Almost surely, 2^19939057 is an apocalyptic number.

It is an amenable number.

19939057 is a deficient number, since it is larger than the sum of its proper divisors (526223).

19939057 is an equidigital number, since it uses as much as digits as its factorization.

19939057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463.

The product of its (nonzero) digits is 76545, while the sum is 43.

The square root of 19939057 is about 4465.3171219970. The cubic root of 19939057 is about 271.1657732220.

The spelling of 19939057 in words is "nineteen million, nine hundred thirty-nine thousand, fifty-seven".