408941257 has 4 divisors (see below), whose sum is σ = 418915476. Its totient is φ = 398967040.

The previous prime is 408941251. The next prime is 408941261. The reversal of 408941257 is 752149804.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 185259321 + 223681936 = 13611^2 + 14956^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-408941257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (408941251) 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 in 3 ways as a sum of consecutive naturals, for example, 4987048 + ... + 4987129.

It is an arithmetic number, because the mean of its divisors is an integer number (104728869).

Almost surely, 2^408941257 is an apocalyptic number.

It is an amenable number.

408941257 is a deficient number, since it is larger than the sum of its proper divisors (9974219).

408941257 is an equidigital number, since it uses as much as digits as its factorization.

408941257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9974218.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 408941257 is about 20222.2960368006. The cubic root of 408941257 is about 742.2558729139.

The spelling of 408941257 in words is "four hundred eight million, nine hundred forty-one thousand, two hundred fifty-seven".