2189340487 has 4 divisors (see below), whose sum is σ = 2190359520. Its totient is φ = 2188321456.

The previous prime is 2189340479. The next prime is 2189340521. The reversal of 2189340487 is 7840439812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2189340487 - 2³ = 2189340479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2189340287) 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, 506287 + ... + 510592.

It is an arithmetic number, because the mean of its divisors is an integer number (547589880).

Almost surely, 2^2189340487 is an apocalyptic number.

2189340487 is a deficient number, since it is larger than the sum of its proper divisors (1019033).

2189340487 is a wasteful number, since it uses less digits than its factorization.

2189340487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019032.

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 2189340487 is about 46790.3888314684. The cubic root of 2189340487 is about 1298.4874888499.

The spelling of 2189340487 in words is "two billion, one hundred eighty-nine million, three hundred forty thousand, four hundred eighty-seven".