1997473726 has 8 divisors (see below), whose sum is σ = 2997686160. Its totient is φ = 998245008.

The previous prime is 1997473697. The next prime is 1997473729. The reversal of 1997473726 is 6273747991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997473729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240831 + ... + 248986.

It is an arithmetic number, because the mean of its divisors is an integer number (374710770).

Almost surely, 2^1997473726 is an apocalyptic number.

1997473726 is a deficient number, since it is larger than the sum of its proper divisors (1000212434).

1997473726 is a wasteful number, since it uses less digits than its factorization.

1997473726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491858.

The product of its digits is 4000752, while the sum is 55.

The square root of 1997473726 is about 44693.1060231889. The cubic root of 1997473726 is about 1259.3903420815.

The spelling of 1997473726 in words is "one billion, nine hundred ninety-seven million, four hundred seventy-three thousand, seven hundred twenty-six".