71420243 has 12 divisors (see below), whose sum is σ = 74564568. Its totient is φ = 68402880.

The previous prime is 71420233. The next prime is 71420263. The reversal of 71420243 is 34202417.

It is not a de Polignac number, because 71420243 - 2¹⁰ = 71419219 is a prime.

It is a super-2 number, since 2×71420243² = 10201702220358098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71420233) 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 11 ways as a sum of consecutive naturals, for example, 136823 + ... + 137343.

It is an arithmetic number, because the mean of its divisors is an integer number (6213714).

Almost surely, 2^71420243 is an apocalyptic number.

71420243 is a deficient number, since it is larger than the sum of its proper divisors (3144325).

71420243 is a wasteful number, since it uses less digits than its factorization.

71420243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742 (or 713 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 71420243 is about 8451.0498164429. The cubic root of 71420243 is about 414.8971400373.

The spelling of 71420243 in words is "seventy-one million, four hundred twenty thousand, two hundred forty-three".