1640121234 has 16 divisors (see below), whose sum is σ = 3283376160. Its totient is φ = 546184800.

The previous prime is 1640121227. The next prime is 1640121239. The reversal of 1640121234 is 4321210461.

It is not an unprimeable number, because it can be changed into a prime (1640121239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123739 + ... + 136350.

It is an arithmetic number, because the mean of its divisors is an integer number (205211010).

Almost surely, 2^1640121234 is an apocalyptic number.

1640121234 is an abundant number, since it is smaller than the sum of its proper divisors (1643254926).

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

1640121234 is a wasteful number, since it uses less digits than its factorization.

1640121234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261145.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1640121234 is about 40498.4102650956. The cubic root of 1640121234 is about 1179.3027658286.

Adding to 1640121234 its reverse (4321210461), we get a palindrome (5961331695).

The spelling of 1640121234 in words is "one billion, six hundred forty million, one hundred twenty-one thousand, two hundred thirty-four".