501243394 has 4 divisors (see below), whose sum is σ = 751865094. Its totient is φ = 250621696.

The previous prime is 501243377. The next prime is 501243469. The reversal of 501243394 is 493342105.

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., 416364025 + 84879369 = 20405^2 + 9213^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125310847 + ... + 125310850.

Almost surely, 2^501243394 is an apocalyptic number.

501243394 is a deficient number, since it is larger than the sum of its proper divisors (250621700).

501243394 is a wasteful number, since it uses less digits than its factorization.

501243394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250621699.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 501243394 is about 22388.4656463993. The cubic root of 501243394 is about 794.3579030136.

Adding to 501243394 its reverse (493342105), we get a palindrome (994585499).

The spelling of 501243394 in words is "five hundred one million, two hundred forty-three thousand, three hundred ninety-four".