19970128 has 20 divisors (see below), whose sum is σ = 38761780. Its totient is φ = 9967104.

The previous prime is 19970117. The next prime is 19970131. The reversal of 19970128 is 82107991.

It can be written as a sum of positive squares in 2 ways, for example, as 10679824 + 9290304 = 3268^2 + 3048^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15526 + ... + 16762.

It is an arithmetic number, because the mean of its divisors is an integer number (1938089).

Almost surely, 2^19970128 is an apocalyptic number.

It is an amenable number.

19970128 is a deficient number, since it is larger than the sum of its proper divisors (18791652).

19970128 is a wasteful number, since it uses less digits than its factorization.

19970128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2254 (or 2248 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 19970128 is about 4468.7949158582. The cubic root of 19970128 is about 271.3065525159.

The spelling of 19970128 in words is "nineteen million, nine hundred seventy thousand, one hundred twenty-eight".