40128336247 has 4 divisors (see below), whose sum is σ = 40265293320. Its totient is φ = 39991379176.

The previous prime is 40128336181. The next prime is 40128336271. The reversal of 40128336247 is 74263382104.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 40128336247 - 2⁷ = 40128336119 is a prime.

It is a super-2 number, since 2×40128336247² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40128336277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68478097 + ... + 68478682.

It is an arithmetic number, because the mean of its divisors is an integer number (10066323330).

Almost surely, 2^40128336247 is an apocalyptic number.

40128336247 is a deficient number, since it is larger than the sum of its proper divisors (136957073).

40128336247 is a wasteful number, since it uses less digits than its factorization.

40128336247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136957072.

The product of its (nonzero) digits is 193536, while the sum is 40.

The spelling of 40128336247 in words is "forty billion, one hundred twenty-eight million, three hundred thirty-six thousand, two hundred forty-seven".