509400855 has 12 divisors (see below), whose sum is σ = 882961560. Its totient is φ = 271680432.

The previous prime is 509400821. The next prime is 509400889. The reversal of 509400855 is 558004905.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (509400821) and next prime (509400889).

It is not a de Polignac number, because 509400855 - 2⁸ = 509400599 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5659965 + ... + 5660054.

It is an arithmetic number, because the mean of its divisors is an integer number (73580130).

Almost surely, 2^509400855 is an apocalyptic number.

509400855 is a deficient number, since it is larger than the sum of its proper divisors (373560705).

509400855 is a wasteful number, since it uses less digits than its factorization.

509400855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11320030 (or 11320027 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 509400855 is about 22569.9103897202. The cubic root of 509400855 is about 798.6439814616.

The spelling of 509400855 in words is "five hundred nine million, four hundred thousand, eight hundred fifty-five".