1640505342 has 16 divisors (see below), whose sum is σ = 3749726592. Its totient is φ = 468715800.

The previous prime is 1640505329. The next prime is 1640505367. The reversal of 1640505342 is 2435050461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19529784 + ... + 19529867.

It is an arithmetic number, because the mean of its divisors is an integer number (234357912).

Almost surely, 2^1640505342 is an apocalyptic number.

1640505342 is an abundant number, since it is smaller than the sum of its proper divisors (2109221250).

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

1640505342 is a wasteful number, since it uses less digits than its factorization.

1640505342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39059663.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 1640505342 is about 40503.1522476955. The cubic root of 1640505342 is about 1179.3948208670.

The spelling of 1640505342 in words is "one billion, six hundred forty million, five hundred five thousand, three hundred forty-two".