40821373849 has 9 divisors (see below), whose sum is σ = 42283615647. Its totient is φ = 39408083064.

The previous prime is 40821373847. The next prime is 40821373883. The reversal of 40821373849 is 94837312804.

It is a happy number.

The square root of 40821373849 is 202043.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 21405738249 + 19415635600 = 146307^2 + 139340^2 .

It is not a de Polignac number, because 40821373849 - 2¹ = 40821373847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40821373847) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5855764 + ... + 5862730.

Almost surely, 2^40821373849 is an apocalyptic number.

40821373849 is the 202043-rd square number.

40821373849 is the 101022-nd centered octagonal number.

It is an amenable number.

40821373849 is a deficient number, since it is larger than the sum of its proper divisors (1462241798).

40821373849 is an frugal number, since it uses more digits than its factorization.

40821373849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13992 (or 6996 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 49.

Multiplying 40821373849 by its sum of digits (49), we get a square (2000247318601 = 1414301²).

The spelling of 40821373849 in words is "forty billion, eight hundred twenty-one million, three hundred seventy-three thousand, eight hundred forty-nine".