1953994660 has 12 divisors (see below), whose sum is σ = 4103388828. Its totient is φ = 781597856.

The previous prime is 1953994649. The next prime is 1953994663. The reversal of 1953994660 is 664993591.

It can be written as a sum of positive squares in 2 ways, for example, as 1344102244 + 609892416 = 36662^2 + 24696^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1953994598 and 1953994607.

It is not an unprimeable number, because it can be changed into a prime (1953994663) 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, 48849847 + ... + 48849886.

It is an arithmetic number, because the mean of its divisors is an integer number (341949069).

Almost surely, 2^1953994660 is an apocalyptic number.

1953994660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1953994660 is an abundant number, since it is smaller than the sum of its proper divisors (2149394168).

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

1953994660 is a wasteful number, since it uses less digits than its factorization.

1953994660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97699742 (or 97699740 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 52.

The square root of 1953994660 is about 44204.0118088845. The cubic root of 1953994660 is about 1250.1854999371.

The spelling of 1953994660 in words is "one billion, nine hundred fifty-three million, nine hundred ninety-four thousand, six hundred sixty".