40220243293 has 4 divisors (see below), whose sum is σ = 41517670528. Its totient is φ = 38922816060.

The previous prime is 40220243291. The next prime is 40220243333. The reversal of 40220243293 is 39234202204.

40220243293 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40220243293 - 2¹ = 40220243291 is a prime.

It is a super-2 number, since 2×40220243293² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 1297427203 = 40220243293 / (4 + 0 + 2 + 2 + 0 + 2 + 4 + 3 + 2 + 9 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40220243291) 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, 648713571 + ... + 648713632.

It is an arithmetic number, because the mean of its divisors is an integer number (10379417632).

Almost surely, 2^40220243293 is an apocalyptic number.

It is an amenable number.

40220243293 is a deficient number, since it is larger than the sum of its proper divisors (1297427235).

40220243293 is a wasteful number, since it uses less digits than its factorization.

40220243293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1297427234.

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 40220243293 its reverse (39234202204), we get a palindrome (79454445497).

The spelling of 40220243293 in words is "forty billion, two hundred twenty million, two hundred forty-three thousand, two hundred ninety-three".