540736421 has 4 divisors (see below), whose sum is σ = 543161472. Its totient is φ = 538311372.

The previous prime is 540736411. The next prime is 540736423. The reversal of 540736421 is 124637045.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-540736421 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 (540736423) 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, 1212191 + ... + 1212636.

It is an arithmetic number, because the mean of its divisors is an integer number (135790368).

Almost surely, 2^540736421 is an apocalyptic number.

It is an amenable number.

540736421 is a deficient number, since it is larger than the sum of its proper divisors (2425051).

540736421 is a wasteful number, since it uses less digits than its factorization.

540736421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425050.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 540736421 is about 23253.7399357609. The cubic root of 540736421 is about 814.6952935224.

The spelling of 540736421 in words is "five hundred forty million, seven hundred thirty-six thousand, four hundred twenty-one".