19974138 has 8 divisors (see below), whose sum is σ = 39948288. Its totient is φ = 6658044.

The previous prime is 19974121. The next prime is 19974139. The reversal of 19974138 is 83147991.

It is a happy number.

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

19974138 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 19974138.

It is not an unprimeable number, because it can be changed into a prime (19974139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1664506 + ... + 1664517.

It is an arithmetic number, because the mean of its divisors is an integer number (4993536).

Almost surely, 2^19974138 is an apocalyptic number.

19974138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19974138 is a wasteful number, since it uses less digits than its factorization.

19974138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3329028.

The product of its digits is 54432, while the sum is 42.

The square root of 19974138 is about 4469.2435601565. The cubic root of 19974138 is about 271.3247107448.

The spelling of 19974138 in words is "nineteen million, nine hundred seventy-four thousand, one hundred thirty-eight".