840499101 has 24 divisors (see below), whose sum is σ = 1309728056. Its totient is φ = 516326400.

The previous prime is 840499061. The next prime is 840499103. The reversal of 840499101 is 101994048.

It can be written as a sum of positive squares in 4 ways, for example, as 284765625 + 555733476 = 16875^2 + 23574^2 .

It is not a de Polignac number, because 840499101 - 2¹⁷ = 840368029 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840499103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64341 + ... + 76293.

Almost surely, 2^840499101 is an apocalyptic number.

It is an amenable number.

840499101 is a deficient number, since it is larger than the sum of its proper divisors (469228955).

840499101 is a wasteful number, since it uses less digits than its factorization.

840499101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12573 (or 12570 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 840499101 is about 28991.3625240346. The cubic root of 840499101 is about 943.7256325390.

The spelling of 840499101 in words is "eight hundred forty million, four hundred ninety-nine thousand, one hundred one".