402005542 has 4 divisors (see below), whose sum is σ = 603008316. Its totient is φ = 201002770.

The previous prime is 402005521. The next prime is 402005543. The reversal of 402005542 is 245500204.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 as a sum of consecutive naturals, namely, 100501384 + ... + 100501387.

It is an arithmetic number, because the mean of its divisors is an integer number (150752079).

Almost surely, 2^402005542 is an apocalyptic number.

402005542 is a deficient number, since it is larger than the sum of its proper divisors (201002774).

402005542 is a wasteful number, since it uses less digits than its factorization.

402005542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201002773.

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 402005542 is about 20050.0758602056. The cubic root of 402005542 is about 738.0356607156.

Adding to 402005542 its reverse (245500204), we get a palindrome (647505746).

The spelling of 402005542 in words is "four hundred two million, five thousand, five hundred forty-two".