400351481 has 2 divisors, whose sum is σ = 400351482. Its totient is φ = 400351480.

The previous prime is 400351447. The next prime is 400351517. The reversal of 400351481 is 184153004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 320410000 + 79941481 = 17900^2 + 8941^2 .

It is a cyclic number.

It is not a de Polignac number, because 400351481 - 2²⁶ = 333242617 is a prime.

It is a super-2 number, since 2×400351481² = 320562616677786722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400351481.

It is not a weakly prime, because it can be changed into another prime (400351181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200175740 + 200175741.

It is an arithmetic number, because the mean of its divisors is an integer number (200175741).

Almost surely, 2^400351481 is an apocalyptic number.

It is an amenable number.

400351481 is a deficient number, since it is larger than the sum of its proper divisors (1).

400351481 is an equidigital number, since it uses as much as digits as its factorization.

400351481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 400351481 is about 20008.7850955524. The cubic root of 400351481 is about 737.0220477268.

The spelling of 400351481 in words is "four hundred million, three hundred fifty-one thousand, four hundred eighty-one".