40128738837 has 8 divisors (see below), whose sum is σ = 58369074720. Its totient is φ = 24320447760.

The previous prime is 40128738827. The next prime is 40128738863. The reversal of 40128738837 is 73883782104.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40128738837 - 2⁴ = 40128738821 is a prime.

It is a super-2 number, since 2×40128738837² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40128738837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40128738827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 608011162 + ... + 608011227.

It is an arithmetic number, because the mean of its divisors is an integer number (7296134340).

Almost surely, 2^40128738837 is an apocalyptic number.

It is an amenable number.

40128738837 is a deficient number, since it is larger than the sum of its proper divisors (18240335883).

40128738837 is a wasteful number, since it uses less digits than its factorization.

40128738837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216022403.

The product of its (nonzero) digits is 1806336, while the sum is 51.

The spelling of 40128738837 in words is "forty billion, one hundred twenty-eight million, seven hundred thirty-eight thousand, eight hundred thirty-seven".