401724157 has 2 divisors, whose sum is σ = 401724158. Its totient is φ = 401724156.

The previous prime is 401724139. The next prime is 401724199. The reversal of 401724157 is 751427104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 348419556 + 53304601 = 18666^2 + 7301^2 .

It is a cyclic number.

It is not a de Polignac number, because 401724157 - 2¹¹ = 401722109 is a prime.

It is a super-2 number, since 2×401724157² = 322764596634721298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401724137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200862078 + 200862079.

It is an arithmetic number, because the mean of its divisors is an integer number (200862079).

Almost surely, 2^401724157 is an apocalyptic number.

It is an amenable number.

401724157 is a deficient number, since it is larger than the sum of its proper divisors (1).

401724157 is an equidigital number, since it uses as much as digits as its factorization.

401724157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 401724157 is about 20043.0575761284. The cubic root of 401724157 is about 737.8634237561.

The spelling of 401724157 in words is "four hundred one million, seven hundred twenty-four thousand, one hundred fifty-seven".