842389690 has 16 divisors (see below), whose sum is σ = 1553285160. Its totient is φ = 328737280.

The previous prime is 842389673. The next prime is 842389741. The reversal of 842389690 is 96983248.

It can be written as a sum of positive squares in 4 ways, for example, as 536524569 + 305865121 = 23163^2 + 17489^2 .

It is a super-3 number, since 3×842389690³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 1026895 + ... + 1027714.

Almost surely, 2^842389690 is an apocalyptic number.

842389690 is a deficient number, since it is larger than the sum of its proper divisors (710895470).

842389690 is a wasteful number, since it uses less digits than its factorization.

842389690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2054657.

The product of its (nonzero) digits is 746496, while the sum is 49.

The square root of 842389690 is about 29023.9502824822. The cubic root of 842389690 is about 944.4326970268.

The spelling of 842389690 in words is "eight hundred forty-two million, three hundred eighty-nine thousand, six hundred ninety".