400400522477 has 4 divisors (see below), whose sum is σ = 401053705020. Its totient is φ = 399747339936.

The previous prime is 400400522387. The next prime is 400400522507. The reversal of 400400522477 is 774225004004.

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 206121448036 + 194279074441 = 454006^2 + 440771^2 .

It is a cyclic number.

It is not a de Polignac number, because 400400522477 - 2¹⁰ = 400400521453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400400522077) 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, 326590352 + ... + 326591577.

It is an arithmetic number, because the mean of its divisors is an integer number (100263426255).

Almost surely, 2^400400522477 is an apocalyptic number.

It is an amenable number.

400400522477 is a deficient number, since it is larger than the sum of its proper divisors (653182543).

400400522477 is an equidigital number, since it uses as much as digits as its factorization.

400400522477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653182542.

The product of its (nonzero) digits is 62720, while the sum is 35.

The spelling of 400400522477 in words is "four hundred billion, four hundred million, five hundred twenty-two thousand, four hundred seventy-seven".