41405781 has 4 divisors (see below), whose sum is σ = 55207712. Its totient is φ = 27603852.

The previous prime is 41405779. The next prime is 41405789. The reversal of 41405781 is 18750414.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 41405781 - 2¹ = 41405779 is a prime.

It is a super-2 number, since 2×41405781² = 3428877400439922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (41405789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6900961 + ... + 6900966.

It is an arithmetic number, because the mean of its divisors is an integer number (13801928).

Almost surely, 2^41405781 is an apocalyptic number.

It is an amenable number.

41405781 is a deficient number, since it is larger than the sum of its proper divisors (13801931).

41405781 is a wasteful number, since it uses less digits than its factorization.

41405781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13801930.

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 41405781 is about 6434.7323953681. The cubic root of 41405781 is about 345.9555697123.

The spelling of 41405781 in words is "forty-one million, four hundred five thousand, seven hundred eighty-one".