1997787612 has 48 divisors (see below), whose sum is σ = 4835980800. Its totient is φ = 641135040.

The previous prime is 1997787599. The next prime is 1997787677. The reversal of 1997787612 is 2167877991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116937 + ... + 132927.

It is an arithmetic number, because the mean of its divisors is an integer number (100749600).

Almost surely, 2^1997787612 is an apocalyptic number.

1997787612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1997787612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2417990400).

1997787612 is an abundant number, since it is smaller than the sum of its proper divisors (2838193188).

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

1997787612 is a wasteful number, since it uses less digits than its factorization.

1997787612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16386 (or 16384 counting only the distinct ones).

The product of its digits is 2667168, while the sum is 57.

The square root of 1997787612 is about 44696.6174559105. The cubic root of 1997787612 is about 1259.4563061185.

The spelling of 1997787612 in words is "one billion, nine hundred ninety-seven million, seven hundred eighty-seven thousand, six hundred twelve".