1200106639 has 4 divisors (see below), whose sum is σ = 1200214480. Its totient is φ = 1199998800.

The previous prime is 1200106631. The next prime is 1200106703. The reversal of 1200106639 is 9366010021.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1200106639 - 2³ = 1200106631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200106631) 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, 35019 + ... + 60220.

It is an arithmetic number, because the mean of its divisors is an integer number (300053620).

Almost surely, 2^1200106639 is an apocalyptic number.

1200106639 is a deficient number, since it is larger than the sum of its proper divisors (107841).

1200106639 is an equidigital number, since it uses as much as digits as its factorization.

1200106639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107840.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 1200106639 is about 34642.5553185674. Note that the first 3 decimals coincide. The cubic root of 1200106639 is about 1062.6900462633.

The spelling of 1200106639 in words is "one billion, two hundred million, one hundred six thousand, six hundred thirty-nine".