401378729 has 2 divisors, whose sum is σ = 401378730. Its totient is φ = 401378728.

The previous prime is 401378723. The next prime is 401378737. The reversal of 401378729 is 927873104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 293779600 + 107599129 = 17140^2 + 10373^2 .

It is a cyclic number.

It is not a de Polignac number, because 401378729 - 2⁴ = 401378713 is a prime.

It is a super-2 number, since 2×401378729² = 322209768187310882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (401378723) 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, 200689364 + 200689365.

It is an arithmetic number, because the mean of its divisors is an integer number (200689365).

Almost surely, 2^401378729 is an apocalyptic number.

It is an amenable number.

401378729 is a deficient number, since it is larger than the sum of its proper divisors (1).

401378729 is an equidigital number, since it uses as much as digits as its factorization.

401378729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 401378729 is about 20034.4385746145. The cubic root of 401378729 is about 737.6518757981.

The spelling of 401378729 in words is "four hundred one million, three hundred seventy-eight thousand, seven hundred twenty-nine".