285978953 has 4 divisors (see below), whose sum is σ = 307977348. Its totient is φ = 263980560.

The previous prime is 285978949. The next prime is 285978961. The reversal of 285978953 is 359879582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 359879582 = 2 ⋅179939791.

It can be written as a sum of positive squares in 2 ways, for example, as 123365449 + 162613504 = 11107^2 + 12752^2 .

It is a cyclic number.

It is not a de Polignac number, because 285978953 - 2² = 285978949 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285978923) 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, 10999178 + ... + 10999203.

It is an arithmetic number, because the mean of its divisors is an integer number (76994337).

Almost surely, 2^285978953 is an apocalyptic number.

It is an amenable number.

285978953 is a deficient number, since it is larger than the sum of its proper divisors (21998395).

285978953 is a wasteful number, since it uses less digits than its factorization.

285978953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21998394.

The product of its digits is 5443200, while the sum is 56.

The square root of 285978953 is about 16910.9122462391. The cubic root of 285978953 is about 658.8370651870.

The spelling of 285978953 in words is "two hundred eighty-five million, nine hundred seventy-eight thousand, nine hundred fifty-three".