1990097326 has 16 divisors (see below), whose sum is σ = 3417362784. Its totient is φ = 851457024.

The previous prime is 1990097309. The next prime is 1990097327. The reversal of 1990097326 is 6237900991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990097327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111555 + ... + 128158.

It is an arithmetic number, because the mean of its divisors is an integer number (213585174).

Almost surely, 2^1990097326 is an apocalyptic number.

1990097326 is a deficient number, since it is larger than the sum of its proper divisors (1427265458).

1990097326 is a wasteful number, since it uses less digits than its factorization.

1990097326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240315.

The product of its (nonzero) digits is 183708, while the sum is 46.

The square root of 1990097326 is about 44610.5069014016. The cubic root of 1990097326 is about 1257.8381771977.

The spelling of 1990097326 in words is "one billion, nine hundred ninety million, ninety-seven thousand, three hundred twenty-six".