1640047542 has 48 divisors (see below), whose sum is σ = 3840993792. Its totient is φ = 465469200.

The previous prime is 1640047501. The next prime is 1640047559. The reversal of 1640047542 is 2457400461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25923 + ... + 62865.

It is an arithmetic number, because the mean of its divisors is an integer number (80020704).

Almost surely, 2^1640047542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1640047542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1920496896).

1640047542 is an abundant number, since it is smaller than the sum of its proper divisors (2200946250).

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

1640047542 is a wasteful number, since it uses less digits than its factorization.

1640047542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37113 (or 37106 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 33.

The square root of 1640047542 is about 40497.5004413853. The cubic root of 1640047542 is about 1179.2851032154.

The spelling of 1640047542 in words is "one billion, six hundred forty million, forty-seven thousand, five hundred forty-two".