840689469 has 32 divisors (see below), whose sum is σ = 1283171840. Its totient is φ = 543589056.

The previous prime is 840689467. The next prime is 840689471. The reversal of 840689469 is 964986048.

It is an interprime number because it is at equal distance from previous prime (840689467) and next prime (840689471).

It is not a de Polignac number, because 840689469 - 2¹ = 840689467 is a prime.

It is a super-2 number, since 2×840689469² = 1413517566575003922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840689467) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 365487 + ... + 367779.

It is an arithmetic number, because the mean of its divisors is an integer number (40099120).

Almost surely, 2^840689469 is an apocalyptic number.

It is an amenable number.

840689469 is a deficient number, since it is larger than the sum of its proper divisors (442482371).

840689469 is a wasteful number, since it uses less digits than its factorization.

840689469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2706 (or 2700 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The square root of 840689469 is about 28994.6455229237. The cubic root of 840689469 is about 943.7968765570.

The spelling of 840689469 in words is "eight hundred forty million, six hundred eighty-nine thousand, four hundred sixty-nine".