5405781 has 4 divisors (see below), whose sum is σ = 7207712. Its totient is φ = 3603852.

The previous prime is 5405773. The next prime is 5405783. The reversal of 5405781 is 1875045.

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 5405781 - 2³ = 5405773 is a prime.

It is a super-2 number, since 2×5405781² = 58444936439922, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

5405781 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5405783) 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, 900961 + ... + 900966.

It is an arithmetic number, because the mean of its divisors is an integer number (1801928).

Almost surely, 2^5405781 is an apocalyptic number.

It is an amenable number.

5405781 is a deficient number, since it is larger than the sum of its proper divisors (1801931).

5405781 is a wasteful number, since it uses less digits than its factorization.

5405781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1801930.

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 5405781 is about 2325.0335481451. The cubic root of 5405781 is about 175.5036484335.

The spelling of 5405781 in words is "five million, four hundred five thousand, seven hundred eighty-one".