400440101 has 4 divisors (see below), whose sum is σ = 401469900. Its totient is φ = 399410304.

The previous prime is 400440077. The next prime is 400440107. The reversal of 400440101 is 101044004.

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 36012001 + 364428100 = 6001^2 + 19090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400440101 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 (400440107) 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, 514316 + ... + 515093.

It is an arithmetic number, because the mean of its divisors is an integer number (100367475).

Almost surely, 2^400440101 is an apocalyptic number.

It is an amenable number.

400440101 is a deficient number, since it is larger than the sum of its proper divisors (1029799).

400440101 is a wasteful number, since it uses less digits than its factorization.

400440101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029798.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 400440101 is about 20010.9995002748. Note that the first 3 decimals coincide. The cubic root of 400440101 is about 737.0764250080.

Adding to 400440101 its reverse (101044004), we get a palindrome (501484105).

The spelling of 400440101 in words is "four hundred million, four hundred forty thousand, one hundred one".