1990507213426 has 8 divisors (see below), whose sum is σ = 2992237526124. Its totient is φ = 993094704720.

The previous prime is 1990507213411. The next prime is 1990507213433. The reversal of 1990507213426 is 6243127050991.

It can be written as a sum of positive squares in 2 ways, for example, as 1973600712801 + 16906500625 = 1404849^2 + 130025^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 1990507213426.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1079449845 + ... + 1079451688.

Almost surely, 2^{1990507213426} is an apocalyptic number.

1990507213426 is a deficient number, since it is larger than the sum of its proper divisors (1001730312698).

1990507213426 is a wasteful number, since it uses less digits than its factorization.

1990507213426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158901996.

The product of its (nonzero) digits is 816480, while the sum is 49.

The spelling of 1990507213426 in words is "one trillion, nine hundred ninety billion, five hundred seven million, two hundred thirteen thousand, four hundred twenty-six".