400155451 has 2 divisors, whose sum is σ = 400155452. Its totient is φ = 400155450.

The previous prime is 400155439. The next prime is 400155467. The reversal of 400155451 is 154551004.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400155451 - 2⁹ = 400154939 is a prime.

It is not a weakly prime, because it can be changed into another prime (400155421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200077725 + 200077726.

It is an arithmetic number, because the mean of its divisors is an integer number (200077726).

Almost surely, 2^400155451 is an apocalyptic number.

400155451 is a deficient number, since it is larger than the sum of its proper divisors (1).

400155451 is an equidigital number, since it uses as much as digits as its factorization.

400155451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 400155451 is about 20003.8858974950. The cubic root of 400155451 is about 736.9017350963.

The spelling of 400155451 in words is "four hundred million, one hundred fifty-five thousand, four hundred fifty-one".