840494377 has 4 divisors (see below), whose sum is σ = 845352900. Its totient is φ = 835635856.

The previous prime is 840494357. The next prime is 840494387. The reversal of 840494377 is 773494048.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 546577641 + 293916736 = 23379^2 + 17144^2 .

It is a cyclic number.

It is not a de Polignac number, because 840494377 - 2¹¹ = 840492329 is a prime.

It is a super-3 number, since 3×840494377³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840494357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2429002 + ... + 2429347.

It is an arithmetic number, because the mean of its divisors is an integer number (211338225).

Almost surely, 2^840494377 is an apocalyptic number.

It is an amenable number.

840494377 is a deficient number, since it is larger than the sum of its proper divisors (4858523).

840494377 is a wasteful number, since it uses less digits than its factorization.

840494377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4858522.

The product of its (nonzero) digits is 677376, while the sum is 46.

The square root of 840494377 is about 28991.2810513782. The cubic root of 840494377 is about 943.7238644751.

The spelling of 840494377 in words is "eight hundred forty million, four hundred ninety-four thousand, three hundred seventy-seven".