1990122763 has 4 divisors (see below), whose sum is σ = 2008380880. Its totient is φ = 1971864648.

The previous prime is 1990122751. The next prime is 1990122791. The reversal of 1990122763 is 3672210991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3672210991 = 21661 ⋅169531.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1990122763 is a prime.

It is a super-2 number, since 2×1990122763² = 7921177223621508338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1990122793) 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, 9128895 + ... + 9129112.

It is an arithmetic number, because the mean of its divisors is an integer number (502095220).

Almost surely, 2^1990122763 is an apocalyptic number.

1990122763 is a deficient number, since it is larger than the sum of its proper divisors (18258117).

1990122763 is a wasteful number, since it uses less digits than its factorization.

1990122763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18258116.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 1990122763 is about 44610.7920014877. The cubic root of 1990122763 is about 1257.8435363147.

The spelling of 1990122763 in words is "one billion, nine hundred ninety million, one hundred twenty-two thousand, seven hundred sixty-three".