400791403 has 4 divisors (see below), whose sum is σ = 401696568. Its totient is φ = 399886240.

The previous prime is 400791383. The next prime is 400791407. The reversal of 400791403 is 304197004.

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

It is a cyclic number.

It is not a de Polignac number, because 400791403 - 2²⁵ = 367236971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400791407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 451918 + ... + 452803.

It is an arithmetic number, because the mean of its divisors is an integer number (100424142).

Almost surely, 2^400791403 is an apocalyptic number.

400791403 is a deficient number, since it is larger than the sum of its proper divisors (905165).

400791403 is an equidigital number, since it uses as much as digits as its factorization.

400791403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905164.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 400791403 is about 20019.7752984393. The cubic root of 400791403 is about 737.2919052074.

The spelling of 400791403 in words is "four hundred million, seven hundred ninety-one thousand, four hundred three".