1906491656 has 16 divisors (see below), whose sum is σ = 3784946940. Its totient is φ = 897172480.

The previous prime is 1906491623. The next prime is 1906491667. The reversal of 1906491656 is 6561946091.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1658932900 + 247558756 = 40730^2 + 15734^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1906491656.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7009025 + ... + 7009296.

Almost surely, 2^1906491656 is an apocalyptic number.

It is an amenable number.

1906491656 is a deficient number, since it is larger than the sum of its proper divisors (1878455284).

1906491656 is a wasteful number, since it uses less digits than its factorization.

1906491656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14018344 (or 14018340 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 1906491656 is about 43663.3903401923. The cubic root of 1906491656 is about 1239.9713087361.

The spelling of 1906491656 in words is "one billion, nine hundred six million, four hundred ninety-one thousand, six hundred fifty-six".