1647061940 has 48 divisors (see below), whose sum is σ = 3527000400. Its totient is φ = 645967872.

The previous prime is 1647061939. The next prime is 1647061957. The reversal of 1647061940 is 491607461.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 4218916 + 1642843024 = 2054^2 + 40532^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1647061894 and 1647061903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207566 + ... + 215354.

It is an arithmetic number, because the mean of its divisors is an integer number (73479175).

Almost surely, 2^1647061940 is an apocalyptic number.

1647061940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1647061940 is an abundant number, since it is smaller than the sum of its proper divisors (1879938460).

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

1647061940 is a wasteful number, since it uses less digits than its factorization.

1647061940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8004 (or 8002 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 1647061940 is about 40584.0108909901. The cubic root of 1647061940 is about 1180.9639590338.

The spelling of 1647061940 in words is "one billion, six hundred forty-seven million, sixty-one thousand, nine hundred forty".