1671820340 has 24 divisors (see below), whose sum is σ = 3577066920. Its totient is φ = 656110208.

The previous prime is 1671820303. The next prime is 1671820399. The reversal of 1671820340 is 430281761.

It can be written as a sum of positive squares in 4 ways, for example, as 501222544 + 1170597796 = 22388^2 + 34214^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1671820297 and 1671820306.

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, 787535 + ... + 789654.

It is an arithmetic number, because the mean of its divisors is an integer number (149044455).

Almost surely, 2^1671820340 is an apocalyptic number.

1671820340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1671820340 is an abundant number, since it is smaller than the sum of its proper divisors (1905246580).

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

1671820340 is a wasteful number, since it uses less digits than its factorization.

1671820340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1577251 (or 1577249 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 1671820340 is about 40887.8996770438. The cubic root of 1671820340 is about 1186.8519151033.

The spelling of 1671820340 in words is "one billion, six hundred seventy-one million, eight hundred twenty thousand, three hundred forty".