1906640356 has 12 divisors (see below), whose sum is σ = 3359015100. Its totient is φ = 946921760.

The previous prime is 1906640347. The next prime is 1906640381. The reversal of 1906640356 is 6530466091.

It can be written as a sum of positive squares in 2 ways, for example, as 168584256 + 1738056100 = 12984^2 + 41690^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1598935 + ... + 1600126.

It is an arithmetic number, because the mean of its divisors is an integer number (279917925).

Almost surely, 2^1906640356 is an apocalyptic number.

It is an amenable number.

1906640356 is a deficient number, since it is larger than the sum of its proper divisors (1452374744).

1906640356 is a wasteful number, since it uses less digits than its factorization.

1906640356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3199214 (or 3199212 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 1906640356 is about 43665.0931065079. The cubic root of 1906640356 is about 1240.0035457755.

The spelling of 1906640356 in words is "one billion, nine hundred six million, six hundred forty thousand, three hundred fifty-six".