1640172530 has 16 divisors (see below), whose sum is σ = 3107695680. Its totient is φ = 621538992.

The previous prime is 1640172509. The next prime is 1640172559. The reversal of 1640172530 is 352710461.

It is a junction number, because it is equal to n+sod(n) for n = 1640172493 and 1640172502.

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, 4316054 + ... + 4316433.

It is an arithmetic number, because the mean of its divisors is an integer number (194230980).

Almost surely, 2^1640172530 is an apocalyptic number.

1640172530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1640172530 is a deficient number, since it is larger than the sum of its proper divisors (1467523150).

1640172530 is a wasteful number, since it uses less digits than its factorization.

1640172530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8632513.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 1640172530 is about 40499.0435689536. The cubic root of 1640172530 is about 1179.3150602214.

Adding to 1640172530 its reverse (352710461), we get a palindrome (1992882991).

The spelling of 1640172530 in words is "one billion, six hundred forty million, one hundred seventy-two thousand, five hundred thirty".