400951 has 4 divisors (see below), whose sum is σ = 402232. Its totient is φ = 399672.

The previous prime is 400949. The next prime is 400963. The reversal of 400951 is 159004.

400951 = 256² + 257² + ... + 261².

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 400951 - 2¹ = 400949 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400931) 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 3 ways as a sum of consecutive naturals, for example, 181 + ... + 913.

It is an arithmetic number, because the mean of its divisors is an integer number (100558).

2⁴⁰⁰⁹⁵¹ is an apocalyptic number.

400951 is a deficient number, since it is larger than the sum of its proper divisors (1281).

400951 is an equidigital number, since it uses as much as digits as its factorization.

400951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 400951 is about 633.2069172080. The cubic root of 400951 is about 73.7389756575.

Adding to 400951 its reverse (159004), we get a palindrome (559955).

The spelling of 400951 in words is "four hundred thousand, nine hundred fifty-one".