40015988381 has 4 divisors (see below), whose sum is σ = 40081267932. Its totient is φ = 39950708832.

The previous prime is 40015988377. The next prime is 40015988393. The reversal of 40015988381 is 18388951004.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10622600356 + 29393388025 = 103066^2 + 171445^2 .

It is a cyclic number.

It is not a de Polignac number, because 40015988381 - 2² = 40015988377 is a prime.

It is a super-2 number, since 2×40015988381² (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 (40015988351) 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, 32638856 + ... + 32640081.

It is an arithmetic number, because the mean of its divisors is an integer number (10020316983).

Almost surely, 2^40015988381 is an apocalyptic number.

It is an amenable number.

40015988381 is a deficient number, since it is larger than the sum of its proper divisors (65279551).

40015988381 is an equidigital number, since it uses as much as digits as its factorization.

40015988381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65279550.

The product of its (nonzero) digits is 276480, while the sum is 47.

The spelling of 40015988381 in words is "forty billion, fifteen million, nine hundred eighty-eight thousand, three hundred eighty-one".