400686089 has 4 divisors (see below), whose sum is σ = 404653380. Its totient is φ = 396718800.

The previous prime is 400686053. The next prime is 400686119. The reversal of 400686089 is 980686004.

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

It can be written as a sum of positive squares in 2 ways, for example, as 379938064 + 20748025 = 19492^2 + 4555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400686089 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (400686389) 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, 1983494 + ... + 1983695.

It is an arithmetic number, because the mean of its divisors is an integer number (101163345).

Almost surely, 2^400686089 is an apocalyptic number.

It is an amenable number.

400686089 is a deficient number, since it is larger than the sum of its proper divisors (3967291).

400686089 is a wasteful number, since it uses less digits than its factorization.

400686089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3967290.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 400686089 is about 20017.1448763304. The cubic root of 400686089 is about 737.2273213523.

The spelling of 400686089 in words is "four hundred million, six hundred eighty-six thousand, eighty-nine".