855903243 has 8 divisors (see below), whose sum is σ = 1228989328. Its totient is φ = 526709664.

The previous prime is 855903197. The next prime is 855903247. The reversal of 855903243 is 342309558.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 855903243 - 2¹⁶ = 855837707 is a prime.

It is a super-2 number, since 2×855903243² = 1465140722755834098, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 21946237 = 855903243 / (8 + 5 + 5 + 9 + 0 + 3 + 2 + 4 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (855903247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10973080 + ... + 10973157.

It is an arithmetic number, because the mean of its divisors is an integer number (153623666).

Almost surely, 2^855903243 is an apocalyptic number.

855903243 is a deficient number, since it is larger than the sum of its proper divisors (373086085).

855903243 is a wasteful number, since it uses less digits than its factorization.

855903243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21946253.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 855903243 is about 29255.8240868378. The cubic root of 855903243 is about 949.4561034401.

The spelling of 855903243 in words is "eight hundred fifty-five million, nine hundred three thousand, two hundred forty-three".