19858242 has 16 divisors (see below), whose sum is σ = 39789792. Its totient is φ = 6607200.

The previous prime is 19858231. The next prime is 19858247. The reversal of 19858242 is 24285891.

It is a self number, because there is not a number n which added to its sum of digits gives 19858242.

It is not an unprimeable number, because it can be changed into a prime (19858247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 853 + ... + 6359.

It is an arithmetic number, because the mean of its divisors is an integer number (2486862).

Almost surely, 2^19858242 is an apocalyptic number.

19858242 is an abundant number, since it is smaller than the sum of its proper divisors (19931550).

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

19858242 is a wasteful number, since it uses less digits than its factorization.

19858242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6113.

The product of its digits is 46080, while the sum is 39.

The square root of 19858242 is about 4456.2587447320. The cubic root of 19858242 is about 270.7989231128.

It can be divided in two parts, 19858 and 242, that added together give a triangular number (20100 = T₂₀₀).

The spelling of 19858242 in words is "nineteen million, eight hundred fifty-eight thousand, two hundred forty-two".