538387640 has 32 divisors (see below), whose sum is σ = 1384426080. Its totient is φ = 184589952.

The previous prime is 538387613. The next prime is 538387643. The reversal of 538387640 is 46783835.

It is a super-2 number, since 2×538387640² = 579722501809539200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 538387591 and 538387600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538387643) 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 7 ways as a sum of consecutive naturals, for example, 961127 + ... + 961686.

It is an arithmetic number, because the mean of its divisors is an integer number (43263315).

Almost surely, 2^538387640 is an apocalyptic number.

It is an amenable number.

538387640 is an abundant number, since it is smaller than the sum of its proper divisors (846038440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

538387640 is a wasteful number, since it uses less digits than its factorization.

538387640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1922831 (or 1922827 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 44.

The square root of 538387640 is about 23203.1816783820. The cubic root of 538387640 is about 813.5139920884.

The spelling of 538387640 in words is "five hundred thirty-eight million, three hundred eighty-seven thousand, six hundred forty".