1999661074 has 12 divisors (see below), whose sum is σ = 3176346474. Its totient is φ = 940894272.

The previous prime is 1999661071. The next prime is 1999661077. The reversal of 1999661074 is 4701669991.

It is an interprime number because it is at equal distance from previous prime (1999661071) and next prime (1999661077).

It can be written as a sum of positive squares in 3 ways, for example, as 1811779225 + 187881849 = 42565^2 + 13707^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999661071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 256912 + ... + 264580.

Almost surely, 2^1999661074 is an apocalyptic number.

1999661074 is a deficient number, since it is larger than the sum of its proper divisors (1176685400).

1999661074 is an frugal number, since it uses more digits than its factorization.

1999661074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15357 (or 7688 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 1999661074 is about 44717.5700815686. The cubic root of 1999661074 is about 1259.8498758740.

The spelling of 1999661074 in words is "one billion, nine hundred ninety-nine million, six hundred sixty-one thousand, seventy-four".