491207438 has 4 divisors (see below), whose sum is σ = 736811160. Its totient is φ = 245603718.

The previous prime is 491207413. The next prime is 491207461. The reversal of 491207438 is 834702194.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122801858 + ... + 122801861.

It is an arithmetic number, because the mean of its divisors is an integer number (184202790).

Almost surely, 2^491207438 is an apocalyptic number.

491207438 is a deficient number, since it is larger than the sum of its proper divisors (245603722).

491207438 is a wasteful number, since it uses less digits than its factorization.

491207438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245603721.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 491207438 is about 22163.2000848253. The cubic root of 491207438 is about 789.0205444212.

The spelling of 491207438 in words is "four hundred ninety-one million, two hundred seven thousand, four hundred thirty-eight".