252661406 has 4 divisors (see below), whose sum is σ = 378992112. Its totient is φ = 126330702.

The previous prime is 252661399. The next prime is 252661433. The reversal of 252661406 is 604166252.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 63165350 + ... + 63165353.

It is an arithmetic number, because the mean of its divisors is an integer number (94748028).

Almost surely, 2^252661406 is an apocalyptic number.

252661406 is a deficient number, since it is larger than the sum of its proper divisors (126330706).

252661406 is a wasteful number, since it uses less digits than its factorization.

252661406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126330705.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 252661406 is about 15895.3265458750. The cubic root of 252661406 is about 632.1880799385.

The spelling of 252661406 in words is "two hundred fifty-two million, six hundred sixty-one thousand, four hundred six".