52420402 has 4 divisors (see below), whose sum is σ = 78630606. Its totient is φ = 26210200.

The previous prime is 52420391. The next prime is 52420409. The reversal of 52420402 is 20402425.

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

It can be written as a sum of positive squares in only one way, i.e., 40717161 + 11703241 = 6381^2 + 3421^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 52420402.

It is not an unprimeable number, because it can be changed into a prime (52420409) 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, 13105099 + ... + 13105102.

Almost surely, 2^52420402 is an apocalyptic number.

52420402 is a deficient number, since it is larger than the sum of its proper divisors (26210204).

52420402 is a wasteful number, since it uses less digits than its factorization.

52420402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26210203.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 52420402 is about 7240.1935057013. The cubic root of 52420402 is about 374.2542857808.

Adding to 52420402 its reverse (20402425), we get a palindrome (72822827).

The spelling of 52420402 in words is "fifty-two million, four hundred twenty thousand, four hundred two".