497839640 has 64 divisors (see below), whose sum is σ = 1146074400. Its totient is φ = 194568192.

The previous prime is 497839637. The next prime is 497839663. The reversal of 497839640 is 46938794.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 454934 + ... + 456026.

Almost surely, 2^497839640 is an apocalyptic number.

497839640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 497839640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (573037200).

497839640 is an abundant number, since it is smaller than the sum of its proper divisors (648234760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

497839640 is a wasteful number, since it uses less digits than its factorization.

497839640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356 (or 1352 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 50.

The square root of 497839640 is about 22312.3203634225. The cubic root of 497839640 is about 792.5557564091. Note that the first 3 decimals are identical.

The spelling of 497839640 in words is "four hundred ninety-seven million, eight hundred thirty-nine thousand, six hundred forty".