400344761 has 2 divisors, whose sum is σ = 400344762. Its totient is φ = 400344760.

The previous prime is 400344751. The next prime is 400344793. The reversal of 400344761 is 167443004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 331968400 + 68376361 = 18220^2 + 8269^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400344761 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (400344751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200172380 + 200172381.

It is an arithmetic number, because the mean of its divisors is an integer number (200172381).

Almost surely, 2^400344761 is an apocalyptic number.

It is an amenable number.

400344761 is a deficient number, since it is larger than the sum of its proper divisors (1).

400344761 is an equidigital number, since it uses as much as digits as its factorization.

400344761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 400344761 is about 20008.6171686101. The cubic root of 400344761 is about 737.0179240038.

Adding to 400344761 its reverse (167443004), we get a palindrome (567787765).

The spelling of 400344761 in words is "four hundred million, three hundred forty-four thousand, seven hundred sixty-one".