400444477 has 2 divisors, whose sum is σ = 400444478. Its totient is φ = 400444476.

The previous prime is 400444463. The next prime is 400444481. The reversal of 400444477 is 774444004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 400440121 + 4356 = 20011^2 + 66^2 .

It is a cyclic number.

It is not a de Polignac number, because 400444477 - 2⁷ = 400444349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400444487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200222238 + 200222239.

It is an arithmetic number, because the mean of its divisors is an integer number (200222239).

Almost surely, 2^400444477 is an apocalyptic number.

It is an amenable number.

400444477 is a deficient number, since it is larger than the sum of its proper divisors (1).

400444477 is an equidigital number, since it uses as much as digits as its factorization.

400444477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50176, while the sum is 34.

The square root of 400444477 is about 20011.1088398419. The cubic root of 400444477 is about 737.0791099162.

It can be divided in two parts, 40044 and 4477, that added together give a square (44521 = 211²).

The spelling of 400444477 in words is "four hundred million, four hundred forty-four thousand, four hundred seventy-seven".