1019391642 has 20 divisors (see below), whose sum is σ = 2284192746. Its totient is φ = 339797160.

The previous prime is 1019391619. The next prime is 1019391683. The reversal of 1019391642 is 2461939101.

It is a happy number.

1019391642 is a `hidden beast` number, since 1 + 0 + 1 + 9 + 3 + 9 + 1 + 642 = 666.

It can be written as a sum of positive squares in only one way, i.e., 799136361 + 220255281 = 28269^2 + 14841^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1019391597 and 1019391606.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3146109 + ... + 3146432.

Almost surely, 2^1019391642 is an apocalyptic number.

1019391642 is an abundant number, since it is smaller than the sum of its proper divisors (1264801104).

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

1019391642 is an equidigital number, since it uses as much as digits as its factorization.

1019391642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6292555 (or 6292546 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1019391642 is about 31927.9132108567. The cubic root of 1019391642 is about 1006.4225432963.

The spelling of 1019391642 in words is "one billion, nineteen million, three hundred ninety-one thousand, six hundred forty-two".