2665986 has 16 divisors (see below), whose sum is σ = 5357664. Its totient is φ = 884384.

The previous prime is 2665973. The next prime is 2666021. The reversal of 2665986 is 6895662.

2665986 = T₁₉ + T₂₀ + ... + T₂₅₁.

It is a d-powerful number, because it can be written as 2¹³ + 6² + 6⁷ + 5 + 9³ + 8⁷ + 6⁷ .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 445 + ... + 2351.

It is an arithmetic number, because the mean of its divisors is an integer number (334854).

2^2665986 is an apocalyptic number.

2665986 is an abundant number, since it is smaller than the sum of its proper divisors (2691678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2665986 is a wasteful number, since it uses less digits than its factorization.

2665986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2145.

The product of its digits is 155520, while the sum is 42.

The square root of 2665986 is about 1632.7847378023. The cubic root of 2665986 is about 138.6604551684.

The spelling of 2665986 in words is "two million, six hundred sixty-five thousand, nine hundred eighty-six".