71440369 has 64 divisors (see below), whose sum is σ = 104509440. Its totient is φ = 47013120.

The previous prime is 71440367. The next prime is 71440381. The reversal of 71440369 is 96304417.

It is a happy number.

It is not a de Polignac number, because 71440369 - 2¹ = 71440367 is a prime.

It is a super-2 number, since 2×71440369² = 10207452645712322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71440367) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 667614 + ... + 667720.

It is an arithmetic number, because the mean of its divisors is an integer number (1632960).

Almost surely, 2^71440369 is an apocalyptic number.

It is an amenable number.

71440369 is a deficient number, since it is larger than the sum of its proper divisors (33069071).

71440369 is a wasteful number, since it uses less digits than its factorization.

71440369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 71440369 is about 8452.2404722062. The cubic root of 71440369 is about 414.9361086138.

The spelling of 71440369 in words is "seventy-one million, four hundred forty thousand, three hundred sixty-nine".