1997322408 has 64 divisors (see below), whose sum is σ = 5840136000. Its totient is φ = 630732096.

The previous prime is 1997322391. The next prime is 1997322409. The reversal of 1997322408 is 8042237991.

It is not an unprimeable number, because it can be changed into a prime (1997322409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 239235 + ... + 247442.

It is an arithmetic number, because the mean of its divisors is an integer number (91252125).

Almost surely, 2^1997322408 is an apocalyptic number.

1997322408 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1997322408 is an abundant number, since it is smaller than the sum of its proper divisors (3842813592).

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

1997322408 is a wasteful number, since it uses less digits than its factorization.

1997322408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486711 (or 486701 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 1997322408 is about 44691.4131349636. The cubic root of 1997322408 is about 1259.3585397040.

The spelling of 1997322408 in words is "one billion, nine hundred ninety-seven million, three hundred twenty-two thousand, four hundred eight".