1640513434 has 32 divisors (see below), whose sum is σ = 2895235200. Its totient is φ = 696822336.

The previous prime is 1640513429. The next prime is 1640513449. The reversal of 1640513434 is 4343150461.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1640513396 and 1640513405.

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, 66937 + ... + 88099.

It is an arithmetic number, because the mean of its divisors is an integer number (90476100).

Almost surely, 2^1640513434 is an apocalyptic number.

1640513434 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1640513434 is a deficient number, since it is larger than the sum of its proper divisors (1254721766).

1640513434 is a wasteful number, since it uses less digits than its factorization.

1640513434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21299 (or 21285 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 1640513434 is about 40503.2521410318. The cubic root of 1640513434 is about 1179.3967600352.

Adding to 1640513434 its reverse (4343150461), we get a palindrome (5983663895).

The spelling of 1640513434 in words is "one billion, six hundred forty million, five hundred thirteen thousand, four hundred thirty-four".