851954640 has 40 divisors (see below), whose sum is σ = 2641060128. Its totient is φ = 227187840.

The previous prime is 851954599. The next prime is 851954659. The reversal of 851954640 is 46459158.

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 = 851954592 and 851954601.

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, 1774666 + ... + 1775145.

Almost surely, 2^851954640 is an apocalyptic number.

851954640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

851954640 is an abundant number, since it is smaller than the sum of its proper divisors (1789105488).

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

851954640 is a wasteful number, since it uses less digits than its factorization.

851954640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3549827 (or 3549821 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 42.

The square root of 851954640 is about 29188.2620243138. The cubic root of 851954640 is about 947.9937865675.

The spelling of 851954640 in words is "eight hundred fifty-one million, nine hundred fifty-four thousand, six hundred forty".