520903494 has 64 divisors (see below), whose sum is σ = 1278996480. Its totient is φ = 156309120.

The previous prime is 520903489. The next prime is 520903531. The reversal of 520903494 is 494309025.

520903494 is a `hidden beast` number, since 520 + 90 + 3 + 49 + 4 = 666.

It is a super-3 number, since 3×520903494³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8779 + ... + 33449.

It is an arithmetic number, because the mean of its divisors is an integer number (19984320).

Almost surely, 2^520903494 is an apocalyptic number.

520903494 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 520903494, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (639498240).

520903494 is an abundant number, since it is smaller than the sum of its proper divisors (758092986).

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

520903494 is a wasteful number, since it uses less digits than its factorization.

520903494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24722 (or 24716 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 520903494 is about 22823.3103208102. The cubic root of 520903494 is about 804.6106132180.

The spelling of 520903494 in words is "five hundred twenty million, nine hundred three thousand, four hundred ninety-four".