817478142 has 32 divisors (see below), whose sum is σ = 1762178208. Its totient is φ = 251323776.

The previous prime is 817478113. The next prime is 817478147. The reversal of 817478142 is 241874718.

It is a junction number, because it is equal to n+sod(n) for n = 817478094 and 817478103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (817478147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109728 + ... + 116940.

It is an arithmetic number, because the mean of its divisors is an integer number (55068069).

Almost surely, 2^817478142 is an apocalyptic number.

817478142 is an abundant number, since it is smaller than the sum of its proper divisors (944700066).

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

817478142 is a wasteful number, since it uses less digits than its factorization.

817478142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8684.

The product of its digits is 100352, while the sum is 42.

The square root of 817478142 is about 28591.5746680731. The cubic root of 817478142 is about 935.0296508465.

The spelling of 817478142 in words is "eight hundred seventeen million, four hundred seventy-eight thousand, one hundred forty-two".