1690797027 has 4 divisors (see below), whose sum is σ = 2254396040. Its totient is φ = 1127198016.

The previous prime is 1690797013. The next prime is 1690797037. The reversal of 1690797027 is 7207970961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7207970961 = 3 ⋅2402656987.

It is not a de Polignac number, because 1690797027 - 2¹⁸ = 1690534883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1690797037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281799502 + ... + 281799507.

It is an arithmetic number, because the mean of its divisors is an integer number (563599010).

Almost surely, 2^1690797027 is an apocalyptic number.

1690797027 is a deficient number, since it is larger than the sum of its proper divisors (563599013).

1690797027 is an equidigital number, since it uses as much as digits as its factorization.

1690797027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563599012.

The product of its (nonzero) digits is 333396, while the sum is 48.

The square root of 1690797027 is about 41119.3023651910. The cubic root of 1690797027 is about 1191.3256481312.

The spelling of 1690797027 in words is "one billion, six hundred ninety million, seven hundred ninety-seven thousand, twenty-seven".