1906340778 has 32 divisors (see below), whose sum is σ = 4238219520. Its totient is φ = 635160960.

The previous prime is 1906340773. The next prime is 1906340819. The reversal of 1906340778 is 8770436091.

1906340778 is a `hidden beast` number, since 1 + 9 + 0 + 634 + 0 + 7 + 7 + 8 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1906340771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137626 + ... + 150842.

It is an arithmetic number, because the mean of its divisors is an integer number (132444360).

Almost surely, 2^1906340778 is an apocalyptic number.

1906340778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1906340778 is an abundant number, since it is smaller than the sum of its proper divisors (2331878742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1906340778 is a wasteful number, since it uses less digits than its factorization.

1906340778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15899 (or 15893 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 1906340778 is about 43661.6625656880. The cubic root of 1906340778 is about 1239.9385978094.

The spelling of 1906340778 in words is "one billion, nine hundred six million, three hundred forty thousand, seven hundred seventy-eight".