19975942 has 16 divisors (see below), whose sum is σ = 34659072. Its totient is φ = 8457480.

The previous prime is 19975933. The next prime is 19975981. The reversal of 19975942 is 24957991.

19975942 = 449² + 450² + ... + 531².

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19975892 and 19975901.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7434 + ... + 9757.

It is an arithmetic number, because the mean of its divisors is an integer number (2166192).

Almost surely, 2^19975942 is an apocalyptic number.

19975942 is a deficient number, since it is larger than the sum of its proper divisors (14683130).

19975942 is a wasteful number, since it uses less digits than its factorization.

19975942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17283.

The product of its digits is 204120, while the sum is 46.

The square root of 19975942 is about 4469.4453794626. The cubic root of 19975942 is about 271.3328788911.

The spelling of 19975942 in words is "nineteen million, nine hundred seventy-five thousand, nine hundred forty-two".