1997383761 has 6 divisors (see below), whose sum is σ = 2885109890. Its totient is φ = 1331589168.

The previous prime is 1997383753. The next prime is 1997383789. The reversal of 1997383761 is 1673837991.

1997383761 is a `hidden beast` number, since 199 + 7 + 383 + 76 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1983366225 + 14017536 = 44535^2 + 3744^2 .

It is not a de Polignac number, because 1997383761 - 2³ = 1997383753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1997383698 and 1997383707.

It is not an unprimeable number, because it can be changed into a prime (1997383741) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 110965756 + ... + 110965773.

Almost surely, 2^1997383761 is an apocalyptic number.

It is an amenable number.

1997383761 is a deficient number, since it is larger than the sum of its proper divisors (887726129).

1997383761 is a wasteful number, since it uses less digits than its factorization.

1997383761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221931535 (or 221931532 counting only the distinct ones).

The product of its digits is 1714608, while the sum is 54.

The square root of 1997383761 is about 44692.0995367190. The cubic root of 1997383761 is about 1259.3714344063.

The spelling of 1997383761 in words is "one billion, nine hundred ninety-seven million, three hundred eighty-three thousand, seven hundred sixty-one".