1640747442 has 32 divisors (see below), whose sum is σ = 3396919680. Its totient is φ = 527703680.

The previous prime is 1640747419. The next prime is 1640747467. The reversal of 1640747442 is 2447470461.

It is a happy number.

1640747442 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 1640747442.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 422803 + ... + 426665.

It is an arithmetic number, because the mean of its divisors is an integer number (106153740).

Almost surely, 2^1640747442 is an apocalyptic number.

1640747442 is an abundant number, since it is smaller than the sum of its proper divisors (1756172238).

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

1640747442 is a wasteful number, since it uses less digits than its factorization.

1640747442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6338.

The product of its (nonzero) digits is 150528, while the sum is 39.

The square root of 1640747442 is about 40506.1407937118. The cubic root of 1640747442 is about 1179.4528349911.

The spelling of 1640747442 in words is "one billion, six hundred forty million, seven hundred forty-seven thousand, four hundred forty-two".