402213541 has 4 divisors (see below), whose sum is σ = 402278284. Its totient is φ = 402148800.

The previous prime is 402213533. The next prime is 402213547. The reversal of 402213541 is 145312204.

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

It can be written as a sum of positive squares in 2 ways, for example, as 318765316 + 83448225 = 17854^2 + 9135^2 .

It is a cyclic number.

It is not a de Polignac number, because 402213541 - 2³ = 402213533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402213547) 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 3 ways as a sum of consecutive naturals, for example, 21930 + ... + 35851.

It is an arithmetic number, because the mean of its divisors is an integer number (100569571).

Almost surely, 2^402213541 is an apocalyptic number.

It is an amenable number.

402213541 is a deficient number, since it is larger than the sum of its proper divisors (64743).

402213541 is an equidigital number, since it uses as much as digits as its factorization.

402213541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64742.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 402213541 is about 20055.2621772940. The cubic root of 402213541 is about 738.1629261348.

Adding to 402213541 its reverse (145312204), we get a palindrome (547525745).

The spelling of 402213541 in words is "four hundred two million, two hundred thirteen thousand, five hundred forty-one".