400051 has 2 divisors, whose sum is σ = 400052. Its totient is φ = 400050.

The previous prime is 400033. The next prime is 400067. The reversal of 400051 is 150004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400051 - 2¹⁷ = 268979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (400031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200025 + 200026.

It is an arithmetic number, because the mean of its divisors is an integer number (200026).

2⁴⁰⁰⁰⁵¹ is an apocalyptic number.

400051 is a deficient number, since it is larger than the sum of its proper divisors (1).

400051 is an equidigital number, since it uses as much as digits as its factorization.

400051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 400051 is about 632.4958497888. The cubic root of 400051 is about 73.6837612665.

Adding to 400051 its reverse (150004), we get a palindrome (550055).

Subtracting from 400051 its reverse (150004), we obtain a cube (250047 = 63³).

The spelling of 400051 in words is "four hundred thousand, fifty-one".