400720351 has 2 divisors, whose sum is σ = 400720352. Its totient is φ = 400720350.

The previous prime is 400720301. The next prime is 400720357. The reversal of 400720351 is 153027004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400720351 - 2¹³ = 400712159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400720357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200360175 + 200360176.

It is an arithmetic number, because the mean of its divisors is an integer number (200360176).

Almost surely, 2^400720351 is an apocalyptic number.

400720351 is a deficient number, since it is larger than the sum of its proper divisors (1).

400720351 is an equidigital number, since it uses as much as digits as its factorization.

400720351 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 400720351 is about 20018.0006743930. Note that the first 3 decimals coincide. The cubic root of 400720351 is about 737.2483337801.

Adding to 400720351 its reverse (153027004), we get a palindrome (553747355).

The spelling of 400720351 in words is "four hundred million, seven hundred twenty thousand, three hundred fifty-one".