19997754 has 16 divisors (see below), whose sum is σ = 45709248. Its totient is φ = 5713632.

The previous prime is 19997743. The next prime is 19997779. The reversal of 19997754 is 45779991.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19997697 and 19997706.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238027 + ... + 238110.

It is an arithmetic number, because the mean of its divisors is an integer number (2856828).

Almost surely, 2^19997754 is an apocalyptic number.

19997754 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

19997754 is an abundant number, since it is smaller than the sum of its proper divisors (25711494).

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

19997754 is a wasteful number, since it uses less digits than its factorization.

19997754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476149.

The product of its digits is 714420, while the sum is 51.

The square root of 19997754 is about 4471.8848375154. The cubic root of 19997754 is about 271.4316003092.

The spelling of 19997754 in words is "nineteen million, nine hundred ninety-seven thousand, seven hundred fifty-four".