402005541 has 8 divisors (see below), whose sum is σ = 612579904. Its totient is φ = 229717440.

The previous prime is 402005521. The next prime is 402005543. The reversal of 402005541 is 145500204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 402005541 - 2⁵ = 402005509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 19143121 = 402005541 / (4 + 0 + 2 + 0 + 0 + 5 + 5 + 4 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402005543) 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 7 ways as a sum of consecutive naturals, for example, 9571540 + ... + 9571581.

It is an arithmetic number, because the mean of its divisors is an integer number (76572488).

Almost surely, 2^402005541 is an apocalyptic number.

It is an amenable number.

402005541 is a deficient number, since it is larger than the sum of its proper divisors (210574363).

402005541 is a wasteful number, since it uses less digits than its factorization.

402005541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19143131.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 402005541 is about 20050.0758352681. The cubic root of 402005541 is about 738.0356601037.

Adding to 402005541 its reverse (145500204), we get a palindrome (547505745).

The spelling of 402005541 in words is "four hundred two million, five thousand, five hundred forty-one".