405721041 has 24 divisors (see below), whose sum is σ = 622852704. Its totient is φ = 232943040.

The previous prime is 405721037. The next prime is 405721073. The reversal of 405721041 is 140127504.

It is not a de Polignac number, because 405721041 - 2² = 405721037 is a prime.

It is a super-2 number, since 2×405721041² = 329219126220247362, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (405721091) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5116 + ... + 28941.

It is an arithmetic number, because the mean of its divisors is an integer number (25952196).

Almost surely, 2^405721041 is an apocalyptic number.

It is an amenable number.

405721041 is a deficient number, since it is larger than the sum of its proper divisors (217131663).

405721041 is a wasteful number, since it uses less digits than its factorization.

405721041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34109 (or 34090 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 405721041 is about 20142.5182387903. The cubic root of 405721041 is about 740.3024335997.

Adding to 405721041 its reverse (140127504), we get a palindrome (545848545).

The spelling of 405721041 in words is "four hundred five million, seven hundred twenty-one thousand, forty-one".