71438155 has 4 divisors (see below), whose sum is σ = 85725792. Its totient is φ = 57150520.

The previous prime is 71438149. The next prime is 71438189. The reversal of 71438155 is 55183417.

It is a happy number.

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

It is not a de Polignac number, because 71438155 - 2⁷ = 71438027 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71438155.

It is an unprimeable number.

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, 7143811 + ... + 7143820.

It is an arithmetic number, because the mean of its divisors is an integer number (21431448).

Almost surely, 2^71438155 is an apocalyptic number.

71438155 is a deficient number, since it is larger than the sum of its proper divisors (14287637).

71438155 is a wasteful number, since it uses less digits than its factorization.

71438155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14287636.

The product of its digits is 16800, while the sum is 34.

The square root of 71438155 is about 8452.1095000006. The cubic root of 71438155 is about 414.9318221576.

The spelling of 71438155 in words is "seventy-one million, four hundred thirty-eight thousand, one hundred fifty-five".