404091878 has 4 divisors (see below), whose sum is σ = 606137820. Its totient is φ = 202045938.

The previous prime is 404091871. The next prime is 404091881. The reversal of 404091878 is 878190404.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404091871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101022968 + ... + 101022971.

It is an arithmetic number, because the mean of its divisors is an integer number (151534455).

Almost surely, 2^404091878 is an apocalyptic number.

404091878 is a deficient number, since it is larger than the sum of its proper divisors (202045942).

404091878 is a wasteful number, since it uses less digits than its factorization.

404091878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202045941.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 404091878 is about 20102.0366629852. The cubic root of 404091878 is about 739.3102155140.

The spelling of 404091878 in words is "four hundred four million, ninety-one thousand, eight hundred seventy-eight".