40869878569 has 9 divisors (see below), whose sum is σ = 44258394999. Its totient is φ = 37723615800.

The previous prime is 40869878527. The next prime is 40869878573. The reversal of 40869878569 is 96587896804.

The square root of 40869878569 is 202163.

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., 6045840025 + 34824038544 = 77755^2 + 186612^2 .

It is not a de Polignac number, because 40869878569 - 2²¹ = 40867781417 is a prime.

It is a super-2 number, since 2×40869878569² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40869878498 and 40869878507.

It is not an unprimeable number, because it can be changed into a prime (40869878519) 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, 2620344 + ... + 2635894.

Almost surely, 2^40869878569 is an apocalyptic number.

40869878569 is the 202163-rd square number.

40869878569 is the 101082-nd centered octagonal number.

It is an amenable number.

40869878569 is a deficient number, since it is larger than the sum of its proper divisors (3388516430).

40869878569 is an frugal number, since it uses more digits than its factorization.

40869878569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31128 (or 15564 counting only the distinct ones).

The product of its (nonzero) digits is 209018880, while the sum is 70.

The spelling of 40869878569 in words is "forty billion, eight hundred sixty-nine million, eight hundred seventy-eight thousand, five hundred sixty-nine".