1690478747 has 2 divisors, whose sum is σ = 1690478748. Its totient is φ = 1690478746.

The previous prime is 1690478743. The next prime is 1690478791. The reversal of 1690478747 is 7478740961.

It is a weak prime.

It is an emirp because it is prime and its reverse (7478740961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1690478747 - 2² = 1690478743 is a prime.

It is not a weakly prime, because it can be changed into another prime (1690478743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845239373 + 845239374.

It is an arithmetic number, because the mean of its divisors is an integer number (845239374).

Almost surely, 2^1690478747 is an apocalyptic number.

1690478747 is a deficient number, since it is larger than the sum of its proper divisors (1).

1690478747 is an equidigital number, since it uses as much as digits as its factorization.

1690478747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2370816, while the sum is 53.

The square root of 1690478747 is about 41115.4319811917. The cubic root of 1690478747 is about 1191.2508907011.

The spelling of 1690478747 in words is "one billion, six hundred ninety million, four hundred seventy-eight thousand, seven hundred forty-seven".