1997369556 has 144 divisors (see below), whose sum is σ = 6027517440. Its totient is φ = 509725440.

The previous prime is 1997369537. The next prime is 1997369603. The reversal of 1997369556 is 6559637991.

It is a self number, because there is not a number n which added to its sum of digits gives 1997369556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 232750 + ... + 241178.

It is an arithmetic number, because the mean of its divisors is an integer number (41857760).

Almost surely, 2^1997369556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1997369556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3013758720).

1997369556 is an abundant number, since it is smaller than the sum of its proper divisors (4030147884).

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

1997369556 is a wasteful number, since it uses less digits than its factorization.

1997369556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8494 (or 8485 counting only the distinct ones).

The product of its digits is 13778100, while the sum is 60.

The square root of 1997369556 is about 44691.9406157307. The cubic root of 1997369556 is about 1259.3684489320.

The spelling of 1997369556 in words is "one billion, nine hundred ninety-seven million, three hundred sixty-nine thousand, five hundred fifty-six".