400085771 has 4 divisors (see below), whose sum is σ = 405566472. Its totient is φ = 394605072.

The previous prime is 400085753. The next prime is 400085779. The reversal of 400085771 is 177580004.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400085771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400085779) 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, 2740241 + ... + 2740386.

It is an arithmetic number, because the mean of its divisors is an integer number (101391618).

Almost surely, 2^400085771 is an apocalyptic number.

400085771 is a deficient number, since it is larger than the sum of its proper divisors (5480701).

400085771 is an equidigital number, since it uses as much as digits as its factorization.

400085771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5480700.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 400085771 is about 20002.1441600644. The cubic root of 400085771 is about 736.8589598086.

The spelling of 400085771 in words is "four hundred million, eighty-five thousand, seven hundred seventy-one".