5406940391 has 4 divisors (see below), whose sum is σ = 5418618912. Its totient is φ = 5395261872.

The previous prime is 5406940367. The next prime is 5406940393. The reversal of 5406940391 is 1930496045.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5406940391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5406940393) 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, 5838566 + ... + 5839491.

It is an arithmetic number, because the mean of its divisors is an integer number (1354654728).

Almost surely, 2^5406940391 is an apocalyptic number.

5406940391 is a deficient number, since it is larger than the sum of its proper divisors (11678521).

5406940391 is a wasteful number, since it uses less digits than its factorization.

5406940391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11678520.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 5406940391 is about 73531.9004990351. The cubic root of 5406940391 is about 1755.1619443474.

The spelling of 5406940391 in words is "five billion, four hundred six million, nine hundred forty thousand, three hundred ninety-one".