1020861642 has 16 divisors (see below), whose sum is σ = 2051985600. Its totient is φ = 338576832.

The previous prime is 1020861637. The next prime is 1020861689. The reversal of 1020861642 is 2461680201.

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, 426303 + ... + 428690.

It is an arithmetic number, because the mean of its divisors is an integer number (128249100).

Almost surely, 2^1020861642 is an apocalyptic number.

1020861642 is an abundant number, since it is smaller than the sum of its proper divisors (1031123958).

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

1020861642 is a wasteful number, since it uses less digits than its factorization.

1020861642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855197.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 1020861642 is about 31950.9255265008. The cubic root of 1020861642 is about 1006.9060769749.

The spelling of 1020861642 in words is "one billion, twenty million, eight hundred sixty-one thousand, six hundred forty-two".