19939557 has 16 divisors (see below), whose sum is σ = 29279232. Its totient is φ = 11969520.

The previous prime is 19939553. The next prime is 19939583. The reversal of 19939557 is 75593991.

It is not a de Polignac number, because 19939557 - 2² = 19939553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19939553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 708 + ... + 6354.

It is an arithmetic number, because the mean of its divisors is an integer number (1829952).

Almost surely, 2^19939557 is an apocalyptic number.

It is an amenable number.

19939557 is a deficient number, since it is larger than the sum of its proper divisors (9339675).

19939557 is a wasteful number, since it uses less digits than its factorization.

19939557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5768.

The product of its digits is 382725, while the sum is 48.

The square root of 19939557 is about 4465.3731087111. The cubic root of 19939557 is about 271.1680398245.

The spelling of 19939557 in words is "nineteen million, nine hundred thirty-nine thousand, five hundred fifty-seven".