878304397 has 4 divisors (see below), whose sum is σ = 884715516. Its totient is φ = 871893280.

The previous prime is 878304389. The next prime is 878304403. The reversal of 878304397 is 793403878.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 793403878 = 2 ⋅396701939.

It can be written as a sum of positive squares in 2 ways, for example, as 469415556 + 408888841 = 21666^2 + 20221^2 .

It is a cyclic number.

It is not a de Polignac number, because 878304397 - 2³ = 878304389 is a prime.

It is a super-2 number, since 2×878304397² = 1542837227579067218, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 878304397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (878304797) 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, 3205354 + ... + 3205627.

It is an arithmetic number, because the mean of its divisors is an integer number (221178879).

Almost surely, 2^878304397 is an apocalyptic number.

It is an amenable number.

878304397 is a deficient number, since it is larger than the sum of its proper divisors (6411119).

878304397 is a wasteful number, since it uses less digits than its factorization.

878304397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6411118.

The product of its (nonzero) digits is 1016064, while the sum is 49.

The square root of 878304397 is about 29636.2007855258. The cubic root of 878304397 is about 957.6680949329.

The spelling of 878304397 in words is "eight hundred seventy-eight million, three hundred four thousand, three hundred ninety-seven".