400251133 has 4 divisors (see below), whose sum is σ = 400317948. Its totient is φ = 400184320.

The previous prime is 400251119. The next prime is 400251157. The reversal of 400251133 is 331152004.

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 190522809 + 209728324 = 13803^2 + 14482^2 .

It is a cyclic number.

It is not a de Polignac number, because 400251133 - 2⁹ = 400250621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400251133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400251833) 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, 23428 + ... + 36733.

It is an arithmetic number, because the mean of its divisors is an integer number (100079487).

Almost surely, 2^400251133 is an apocalyptic number.

It is an amenable number.

400251133 is a deficient number, since it is larger than the sum of its proper divisors (66815).

400251133 is an equidigital number, since it uses as much as digits as its factorization.

400251133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66814.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 400251133 is about 20006.2773398751. The cubic root of 400251133 is about 736.9604644498.

The spelling of 400251133 in words is "four hundred million, two hundred fifty-one thousand, one hundred thirty-three".