19938457 has 16 divisors (see below), whose sum is σ = 25718400. Its totient is φ = 14999040.

The previous prime is 19938437. The next prime is 19938469. The reversal of 19938457 is 75483991.

It is a happy number.

It is not a de Polignac number, because 19938457 - 2¹¹ = 19936409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19938437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2232 + ... + 6697.

It is an arithmetic number, because the mean of its divisors is an integer number (1607400).

Almost surely, 2^19938457 is an apocalyptic number.

19938457 is the 2233-rd decagonal number.

It is an amenable number.

19938457 is a deficient number, since it is larger than the sum of its proper divisors (5779943).

19938457 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (19938456) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (8976).

19938457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8976.

The product of its digits is 272160, while the sum is 46.

The square root of 19938457 is about 4465.2499370136. The cubic root of 19938457 is about 271.1630532489.

The spelling of 19938457 in words is "nineteen million, nine hundred thirty-eight thousand, four hundred fifty-seven".