855384390 has 48 divisors (see below), whose sum is σ = 2541715488. Its totient is φ = 195516288.

The previous prime is 855384323. The next prime is 855384401. The reversal of 855384390 is 93483558.

It is a happy number.

855384390 is a `hidden beast` number, since 8 + 553 + 8 + 4 + 3 + 90 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 678247 + ... + 679506.

It is an arithmetic number, because the mean of its divisors is an integer number (52952406).

Almost surely, 2^855384390 is an apocalyptic number.

855384390 is an abundant number, since it is smaller than the sum of its proper divisors (1686331098).

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

855384390 is a wasteful number, since it uses less digits than its factorization.

855384390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357773 (or 1357770 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The square root of 855384390 is about 29246.9552261428. The cubic root of 855384390 is about 949.2642095822.

The spelling of 855384390 in words is "eight hundred fifty-five million, three hundred eighty-four thousand, three hundred ninety".