1643146140 has 24 divisors (see below), whose sum is σ = 4600809360. Its totient is φ = 438172288.

The previous prime is 1643146129. The next prime is 1643146157. The reversal of 1643146140 is 416413461.

1643146140 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1643146098 and 1643146107.

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, 13692825 + ... + 13692944.

It is an arithmetic number, because the mean of its divisors is an integer number (191700390).

Almost surely, 2^1643146140 is an apocalyptic number.

1643146140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1643146140 is an abundant number, since it is smaller than the sum of its proper divisors (2957663220).

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

1643146140 is a wasteful number, since it uses less digits than its factorization.

1643146140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27385781 (or 27385779 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 1643146140 is about 40535.7390459333. The cubic root of 1643146140 is about 1180.0273238909.

The spelling of 1643146140 in words is "one billion, six hundred forty-three million, one hundred forty-six thousand, one hundred forty".