5400781 has 4 divisors (see below), whose sum is σ = 5718492. Its totient is φ = 5083072.

The previous prime is 5400763. The next prime is 5400793. The reversal of 5400781 is 1870045.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1870045 = 5 ⋅374009.

It can be written as a sum of positive squares in 2 ways, for example, as 4862025 + 538756 = 2205^2 + 734^2 .

It is a cyclic number.

It is not a de Polignac number, because 5400781 - 2¹¹ = 5398733 is a prime.

It is a super-2 number, since 2×5400781² = 58336870819922, 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 (5400701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158830 + ... + 158863.

It is an arithmetic number, because the mean of its divisors is an integer number (1429623).

Almost surely, 2^5400781 is an apocalyptic number.

It is an amenable number.

5400781 is a deficient number, since it is larger than the sum of its proper divisors (317711).

5400781 is a wasteful number, since it uses less digits than its factorization.

5400781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317710.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 5400781 is about 2323.9580460929. The cubic root of 5400781 is about 175.4495218771.

The spelling of 5400781 in words is "five million, four hundred thousand, seven hundred eighty-one".