71538438 has 16 divisors (see below), whose sum is σ = 143585856. Its totient is φ = 23761320.

The previous prime is 71538433. The next prime is 71538443. The reversal of 71538438 is 83483517.

It is an interprime number because it is at equal distance from previous prime (71538433) and next prime (71538443).

It is a super-2 number, since 2×71538438² = 10235496222959688, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 71538396 and 71538405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71538433) 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, 19368 + ... + 22763.

It is an arithmetic number, because the mean of its divisors is an integer number (8974116).

Almost surely, 2^71538438 is an apocalyptic number.

71538438 is an abundant number, since it is smaller than the sum of its proper divisors (72047418).

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

71538438 is a wasteful number, since it uses less digits than its factorization.

71538438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42419.

The product of its digits is 80640, while the sum is 39.

The square root of 71538438 is about 8458.0398438409. The cubic root of 71538438 is about 415.1258881646.

The spelling of 71538438 in words is "seventy-one million, five hundred thirty-eight thousand, four hundred thirty-eight".