1689070387 has 4 divisors (see below), whose sum is σ = 1734720976. Its totient is φ = 1643419800.

The previous prime is 1689070381. The next prime is 1689070421. The reversal of 1689070387 is 7830709861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7830709861 = 13 ⋅602362297.

It is a cyclic number.

It is not a de Polignac number, because 1689070387 - 2⁷ = 1689070259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1689070387.

It is not an unprimeable number, because it can be changed into a prime (1689070381) 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, 22825239 + ... + 22825312.

It is an arithmetic number, because the mean of its divisors is an integer number (433680244).

Almost surely, 2^1689070387 is an apocalyptic number.

1689070387 is a deficient number, since it is larger than the sum of its proper divisors (45650589).

1689070387 is an equidigital number, since it uses as much as digits as its factorization.

1689070387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45650588.

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 1689070387 is about 41098.3015099164. The cubic root of 1689070387 is about 1190.9199832130.

The spelling of 1689070387 in words is "one billion, six hundred eighty-nine million, seventy thousand, three hundred eighty-seven".