401740421 has 2 divisors, whose sum is σ = 401740422. Its totient is φ = 401740420.

The previous prime is 401740403. The next prime is 401740429. The reversal of 401740421 is 124047104.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 381616225 + 20124196 = 19535^2 + 4486^2 .

It is a cyclic number.

It is not a de Polignac number, because 401740421 - 2¹⁰ = 401739397 is a prime.

It is a super-2 number, since 2×401740421² = 322790731730514482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401740429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200870210 + 200870211.

It is an arithmetic number, because the mean of its divisors is an integer number (200870211).

Almost surely, 2^401740421 is an apocalyptic number.

It is an amenable number.

401740421 is a deficient number, since it is larger than the sum of its proper divisors (1).

401740421 is an equidigital number, since it uses as much as digits as its factorization.

401740421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 401740421 is about 20043.4632985420. The cubic root of 401740421 is about 737.8733812095.

Adding to 401740421 its reverse (124047104), we get a palindrome (525787525).

The spelling of 401740421 in words is "four hundred one million, seven hundred forty thousand, four hundred twenty-one".