400061 has 8 divisors (see below), whose sum is σ = 429624. Its totient is φ = 371200.

The previous prime is 400051. The next prime is 400067. The reversal of 400061 is 160004.

It can be written as a sum of positive squares in 4 ways, for example, as 156025 + 244036 = 395^2 + 494^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400061 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1601 + ... + 1833.

It is an arithmetic number, because the mean of its divisors is an integer number (53703).

2⁴⁰⁰⁰⁶¹ is an apocalyptic number.

It is an amenable number.

400061 is a deficient number, since it is larger than the sum of its proper divisors (29563).

400061 is a wasteful number, since it uses less digits than its factorization.

400061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 400061 is about 632.5037549296. The cubic root of 400061 is about 73.6843752145.

Adding to 400061 its reverse (160004), we get a palindrome (560065).

The spelling of 400061 in words is "four hundred thousand, sixty-one".