1571990042 has 16 divisors (see below), whose sum is σ = 2836674240. Its totient is φ = 638251488.

The previous prime is 1571990009. The next prime is 1571990047. The reversal of 1571990042 is 2400991751.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 1571989978 and 1571990005.

It is not an unprimeable number, because it can be changed into a prime (1571990047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2954603 + ... + 2955134.

It is an arithmetic number, because the mean of its divisors is an integer number (177292140).

Almost surely, 2^1571990042 is an apocalyptic number.

1571990042 is a deficient number, since it is larger than the sum of its proper divisors (1264684198).

1571990042 is a wasteful number, since it uses less digits than its factorization.

1571990042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5909765.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 1571990042 is about 39648.3296243360. The cubic root of 1571990042 is about 1162.7417414095.

The spelling of 1571990042 in words is "one billion, five hundred seventy-one million, nine hundred ninety thousand, forty-two".