40423753721 has 6 divisors (see below), whose sum is σ = 43772467230. Its totient is φ = 37314234048.

The previous prime is 40423753703. The next prime is 40423753729. The reversal of 40423753721 is 12735732404.

It can be written as a sum of positive squares in 3 ways, for example, as 4565029225 + 35858724496 = 67565^2 + 189364^2 .

It is not a de Polignac number, because 40423753721 - 2¹⁰ = 40423752697 is a prime.

It is a super-2 number, since 2×40423753721² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40423753729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119596736 + ... + 119597073.

It is an arithmetic number, because the mean of its divisors is an integer number (7295411205).

Almost surely, 2^40423753721 is an apocalyptic number.

It is an amenable number.

40423753721 is a deficient number, since it is larger than the sum of its proper divisors (3348713509).

40423753721 is a wasteful number, since it uses less digits than its factorization.

40423753721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239193835 (or 239193822 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 38.

The spelling of 40423753721 in words is "forty billion, four hundred twenty-three million, seven hundred fifty-three thousand, seven hundred twenty-one".