509876381 has 16 divisors (see below), whose sum is σ = 619474560. Its totient is φ = 409924800.

The previous prime is 509876363. The next prime is 509876383. The reversal of 509876381 is 183678905.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-509876381 is a prime.

It is a super-2 number, since 2×509876381² = 519947847803314322, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509876383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5546 + ... + 32411.

It is an arithmetic number, because the mean of its divisors is an integer number (38717160).

Almost surely, 2^509876381 is an apocalyptic number.

It is an amenable number.

509876381 is a deficient number, since it is larger than the sum of its proper divisors (109598179).

509876381 is a wasteful number, since it uses less digits than its factorization.

509876381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38084.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 509876381 is about 22580.4424447352. The cubic root of 509876381 is about 798.8924157165.

The spelling of 509876381 in words is "five hundred nine million, eight hundred seventy-six thousand, three hundred eighty-one".