1890971797 has 16 divisors (see below), whose sum is σ = 2229514560. Its totient is φ = 1581148800.

The previous prime is 1890971743. The next prime is 1890971807. The reversal of 1890971797 is 7971790981.

It is not a de Polignac number, because 1890971797 - 2¹¹ = 1890969749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1890971737) 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, 16654 + ... + 63712.

It is an arithmetic number, because the mean of its divisors is an integer number (139344660).

Almost surely, 2^1890971797 is an apocalyptic number.

It is an amenable number.

1890971797 is a deficient number, since it is larger than the sum of its proper divisors (338542763).

1890971797 is a wasteful number, since it uses less digits than its factorization.

1890971797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47364.

The product of its (nonzero) digits is 2000376, while the sum is 58.

The square root of 1890971797 is about 43485.3055295694. The cubic root of 1890971797 is about 1236.5974611833.

The spelling of 1890971797 in words is "one billion, eight hundred ninety million, nine hundred seventy-one thousand, seven hundred ninety-seven".