1640400529 has 8 divisors (see below), whose sum is σ = 1681585920. Its totient is φ = 1599271200.

The previous prime is 1640400521. The next prime is 1640400539. The reversal of 1640400529 is 9250040461.

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

It is a cyclic number.

It is not a de Polignac number, because 1640400529 - 2³ = 1640400521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1640400529.

It is not an unprimeable number, because it can be changed into a prime (1640400521) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 48712 + ... + 75190.

It is an arithmetic number, because the mean of its divisors is an integer number (210198240).

Almost surely, 2^1640400529 is an apocalyptic number.

It is an amenable number.

1640400529 is a deficient number, since it is larger than the sum of its proper divisors (41185391).

1640400529 is a wasteful number, since it uses less digits than its factorization.

1640400529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28031.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1640400529 is about 40501.8583400811. The cubic root of 1640400529 is about 1179.3697028868.

The spelling of 1640400529 in words is "one billion, six hundred forty million, four hundred thousand, five hundred twenty-nine".