2086400987 has 4 divisors (see below), whose sum is σ = 2276073816. Its totient is φ = 1896728160.

The previous prime is 2086400917. The next prime is 2086400993. The reversal of 2086400987 is 7890046802.

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 2086400987 - 2¹² = 2086396891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2086400917) 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, 94836398 + ... + 94836419.

It is an arithmetic number, because the mean of its divisors is an integer number (569018454).

Almost surely, 2^2086400987 is an apocalyptic number.

2086400987 is a deficient number, since it is larger than the sum of its proper divisors (189672829).

2086400987 is a wasteful number, since it uses less digits than its factorization.

2086400987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189672828.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 2086400987 is about 45677.1385596778. The cubic root of 2086400987 is about 1277.8089524070.

The spelling of 2086400987 in words is "two billion, eighty-six million, four hundred thousand, nine hundred eighty-seven".