19981602 has 12 divisors (see below), whose sum is σ = 43293510. Its totient is φ = 6660528.

The previous prime is 19981567. The next prime is 19981649. The reversal of 19981602 is 20618991.

It can be written as a sum of positive squares in only one way, i.e., 16329681 + 3651921 = 4041^2 + 1911^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 555027 + ... + 555062.

Almost surely, 2^19981602 is an apocalyptic number.

19981602 is an abundant number, since it is smaller than the sum of its proper divisors (23311908).

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

19981602 is a wasteful number, since it uses less digits than its factorization.

19981602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110097 (or 1110094 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 19981602 is about 4470.0785228002. The cubic root of 19981602 is about 271.3585030322.

It can be divided in two parts, 1998 and 1602, that added together give a square (3600 = 60²).

The spelling of 19981602 in words is "nineteen million, nine hundred eighty-one thousand, six hundred two".