920404487 has 4 divisors (see below), whose sum is σ = 921450096. Its totient is φ = 919358880.

The previous prime is 920404483. The next prime is 920404567. The reversal of 920404487 is 784404029.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 784404029 = 23 ⋅34104523.

It is a cyclic number.

It is not a de Polignac number, because 920404487 - 2² = 920404483 is a prime.

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 920404487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (920404483) 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, 521483 + ... + 523244.

It is an arithmetic number, because the mean of its divisors is an integer number (230362524).

Almost surely, 2^920404487 is an apocalyptic number.

920404487 is a deficient number, since it is larger than the sum of its proper divisors (1045609).

920404487 is a wasteful number, since it uses less digits than its factorization.

920404487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045608.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 920404487 is about 30338.1688142182. The cubic root of 920404487 is about 972.7313413988.

The spelling of 920404487 in words is "nine hundred twenty million, four hundred four thousand, four hundred eighty-seven".