503945389 has 4 divisors (see below), whose sum is σ = 505906524. Its totient is φ = 501984256.

The previous prime is 503945381. The next prime is 503945401. The reversal of 503945389 is 983549305.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 249798025 + 254147364 = 15805^2 + 15942^2 .

It is a cyclic number.

It is not a de Polignac number, because 503945389 - 2³ = 503945381 is a prime.

It is a super-2 number, since 2×503945389² = 507921910188722642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (503945381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 980182 + ... + 980695.

It is an arithmetic number, because the mean of its divisors is an integer number (126476631).

Almost surely, 2^503945389 is an apocalyptic number.

It is an amenable number.

503945389 is a deficient number, since it is larger than the sum of its proper divisors (1961135).

503945389 is a wasteful number, since it uses less digits than its factorization.

503945389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1961134.

The product of its (nonzero) digits is 583200, while the sum is 46.

The square root of 503945389 is about 22448.7280040540. The cubic root of 503945389 is about 795.7826971160.

The spelling of 503945389 in words is "five hundred three million, nine hundred forty-five thousand, three hundred eighty-nine".