1640252122 has 8 divisors (see below), whose sum is σ = 2545218900. Its totient is φ = 791845824.

The previous prime is 1640252099. The next prime is 1640252137. The reversal of 1640252122 is 2212520461.

It can be written as a sum of positive squares in 2 ways, for example, as 1586508561 + 53743561 = 39831^2 + 7331^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14140047 + ... + 14140162.

Almost surely, 2^1640252122 is an apocalyptic number.

1640252122 is a deficient number, since it is larger than the sum of its proper divisors (904966778).

1640252122 is a wasteful number, since it uses less digits than its factorization.

1640252122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28280240.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1640252122 is about 40500.0261975224. The cubic root of 1640252122 is about 1179.3341359638.

Adding to 1640252122 its reverse (2212520461), we get a palindrome (3852772583).

The spelling of 1640252122 in words is "one billion, six hundred forty million, two hundred fifty-two thousand, one hundred twenty-two".