1997478088 has 8 divisors (see below), whose sum is σ = 3745271430. Its totient is φ = 998739040.

The previous prime is 1997478071. The next prime is 1997478137. The reversal of 1997478088 is 8808747991.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1795894884 + 201583204 = 42378^2 + 14198^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124842373 + ... + 124842388.

Almost surely, 2^1997478088 is an apocalyptic number.

It is an amenable number.

1997478088 is a deficient number, since it is larger than the sum of its proper divisors (1747793342).

1997478088 is a wasteful number, since it uses less digits than its factorization.

1997478088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249684767 (or 249684763 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 61.

The square root of 1997478088 is about 44693.1548226348. The cubic root of 1997478088 is about 1259.3912588156.

The spelling of 1997478088 in words is "one billion, nine hundred ninety-seven million, four hundred seventy-eight thousand, eighty-eight".