40020402601 has 9 divisors (see below), whose sum is σ = 42241611351. Its totient is φ = 37910464704.

The previous prime is 40020402577. The next prime is 40020402637. The reversal of 40020402601 is 10620402004.

The square root of 40020402601 is 200051.

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., 32381642601 + 7638760000 = 179949^2 + 87400^2 .

It is not a de Polignac number, because 40020402601 - 2⁹ = 40020402089 is a prime.

It is a super-2 number, since 2×40020402601² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40020402641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3795705 + ... + 3806233.

Almost surely, 2^40020402601 is an apocalyptic number.

40020402601 is the 200051-st square number.

40020402601 is the 100026-th centered octagonal number.

It is an amenable number.

40020402601 is a deficient number, since it is larger than the sum of its proper divisors (2221208750).

40020402601 is an frugal number, since it uses more digits than its factorization.

40020402601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21096 (or 10548 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 40020402601 its reverse (10620402004), we get a palindrome (50640804605).

The spelling of 40020402601 in words is "forty billion, twenty million, four hundred two thousand, six hundred one".