1906220845 has 8 divisors (see below), whose sum is σ = 2361254400. Its totient is φ = 1475783760.

The previous prime is 1906220791. The next prime is 1906220857. The reversal of 1906220845 is 5480226091.

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

It is not a de Polignac number, because 1906220845 - 2⁷ = 1906220717 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6148945 + ... + 6149254.

It is an arithmetic number, because the mean of its divisors is an integer number (295156800).

Almost surely, 2^1906220845 is an apocalyptic number.

It is an amenable number.

1906220845 is a deficient number, since it is larger than the sum of its proper divisors (455033555).

1906220845 is a wasteful number, since it uses less digits than its factorization.

1906220845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12298235.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 1906220845 is about 43660.2891080671. The cubic root of 1906220845 is about 1239.9125946456.

The spelling of 1906220845 in words is "one billion, nine hundred six million, two hundred twenty thousand, eight hundred forty-five".