406777986 has 12 divisors (see below), whose sum is σ = 881352342. Its totient is φ = 135592656.

The previous prime is 406777981. The next prime is 406777991. The reversal of 406777986 is 689777604.

It is an interprime number because it is at equal distance from previous prime (406777981) and next prime (406777991).

It can be written as a sum of positive squares in only one way, i.e., 339849225 + 66928761 = 18435^2 + 8181^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (406777981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11299371 + ... + 11299406.

Almost surely, 2^406777986 is an apocalyptic number.

406777986 is an abundant number, since it is smaller than the sum of its proper divisors (474574356).

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

406777986 is a wasteful number, since it uses less digits than its factorization.

406777986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22598785 (or 22598782 counting only the distinct ones).

The product of its (nonzero) digits is 3556224, while the sum is 54.

The square root of 406777986 is about 20168.7378385461. The cubic root of 406777986 is about 740.9447308075.

The spelling of 406777986 in words is "four hundred six million, seven hundred seventy-seven thousand, nine hundred eighty-six".