40478938493 has 16 divisors (see below), whose sum is σ = 51560968320. Its totient is φ = 30936577536.

The previous prime is 40478938457. The next prime is 40478938499. The reversal of 40478938493 is 39483987404.

It is a cyclic number.

It is not a de Polignac number, because 40478938493 - 2²⁸ = 40210503037 is a prime.

It is a super-2 number, since 2×40478938493² (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 (40478938499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8949296 + ... + 8953817.

It is an arithmetic number, because the mean of its divisors is an integer number (3222560520).

Almost surely, 2^40478938493 is an apocalyptic number.

It is an amenable number.

40478938493 is a deficient number, since it is larger than the sum of its proper divisors (11082029827).

40478938493 is a wasteful number, since it uses less digits than its factorization.

40478938493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17903156.

The product of its (nonzero) digits is 20901888, while the sum is 59.

The spelling of 40478938493 in words is "forty billion, four hundred seventy-eight million, nine hundred thirty-eight thousand, four hundred ninety-three".