1990120703 has 4 divisors (see below), whose sum is σ = 1990243080. Its totient is φ = 1989998328.

The previous prime is 1990120697. The next prime is 1990120721. The reversal of 1990120703 is 3070210991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3070210991 = 9901 ⋅310091.

It is a cyclic number.

It is not a de Polignac number, because 1990120703 - 2⁴ = 1990120687 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1990120703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990120763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32225 + ... + 70842.

It is an arithmetic number, because the mean of its divisors is an integer number (497560770).

Almost surely, 2^1990120703 is an apocalyptic number.

1990120703 is a deficient number, since it is larger than the sum of its proper divisors (122377).

1990120703 is a wasteful number, since it uses less digits than its factorization.

1990120703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122376.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 1990120703 is about 44610.7689128982. The cubic root of 1990120703 is about 1257.8431023116.

It can be divided in two parts, 19901 and 20703, that added together give a palindrome (40604).

The spelling of 1990120703 in words is "one billion, nine hundred ninety million, one hundred twenty thousand, seven hundred three".