1640430357 has 16 divisors (see below), whose sum is σ = 2296890240. Its totient is φ = 1039401792.

The previous prime is 1640430353. The next prime is 1640430383. The reversal of 1640430357 is 7530340461.

It is not a de Polignac number, because 1640430357 - 2² = 1640430353 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640430353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64882 + ... + 86547.

It is an arithmetic number, because the mean of its divisors is an integer number (143555640).

Almost surely, 2^1640430357 is an apocalyptic number.

It is an amenable number.

1640430357 is a deficient number, since it is larger than the sum of its proper divisors (656459883).

1640430357 is a wasteful number, since it uses less digits than its factorization.

1640430357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151612.

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 1640430357 is about 40502.2265684246. The cubic root of 1640430357 is about 1179.3768511464.

The spelling of 1640430357 in words is "one billion, six hundred forty million, four hundred thirty thousand, three hundred fifty-seven".