857235440 has 40 divisors (see below), whose sum is σ = 2025757248. Its totient is φ = 337271040.

The previous prime is 857235439. The next prime is 857235473. The reversal of 857235440 is 44532758.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 857235394 and 857235403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82952 + ... + 92711.

Almost surely, 2^857235440 is an apocalyptic number.

857235440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

857235440 is an abundant number, since it is smaller than the sum of its proper divisors (1168521808).

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

857235440 is a wasteful number, since it uses less digits than its factorization.

857235440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175737 (or 175731 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 38.

The square root of 857235440 is about 29278.5832990601. The cubic root of 857235440 is about 949.9484514966.

The spelling of 857235440 in words is "eight hundred fifty-seven million, two hundred thirty-five thousand, four hundred forty".