491729438 has 4 divisors (see below), whose sum is σ = 737594160. Its totient is φ = 245864718.

The previous prime is 491729431. The next prime is 491729461. The reversal of 491729438 is 834927194.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 834927194 = 2 ⋅417463597.

It is a junction number, because it is equal to n+sod(n) for n = 491729392 and 491729401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491729431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122932358 + ... + 122932361.

It is an arithmetic number, because the mean of its divisors is an integer number (184398540).

Almost surely, 2^491729438 is an apocalyptic number.

491729438 is a deficient number, since it is larger than the sum of its proper divisors (245864722).

491729438 is a wasteful number, since it uses less digits than its factorization.

491729438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245864721.

The product of its digits is 435456, while the sum is 47.

The square root of 491729438 is about 22174.9732356096. The cubic root of 491729438 is about 789.2999395623.

The spelling of 491729438 in words is "four hundred ninety-one million, seven hundred twenty-nine thousand, four hundred thirty-eight".