19961898 has 32 divisors (see below), whose sum is σ = 43863552. Its totient is φ = 6006000.

The previous prime is 19961897. The next prime is 19961917. The reversal of 19961898 is 89816991.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 19961898.

It is not an unprimeable number, because it can be changed into a prime (19961897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8965 + ... + 10967.

It is an arithmetic number, because the mean of its divisors is an integer number (1370736).

Almost surely, 2^19961898 is an apocalyptic number.

19961898 is an abundant number, since it is smaller than the sum of its proper divisors (23901654).

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

19961898 is a wasteful number, since it uses less digits than its factorization.

19961898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2170.

The product of its digits is 279936, while the sum is 51.

The square root of 19961898 is about 4467.8739910611. The cubic root of 19961898 is about 271.2692775132.

The spelling of 19961898 in words is "nineteen million, nine hundred sixty-one thousand, eight hundred ninety-eight".