400208720903 has 4 divisors (see below), whose sum is σ = 400211728560. Its totient is φ = 400205713248.

The previous prime is 400208720867. The next prime is 400208720911. The reversal of 400208720903 is 309027802004.

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 400208720903 - 2⁶ = 400208720839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400208720203) 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, 1294523 + ... + 1573596.

It is an arithmetic number, because the mean of its divisors is an integer number (100052932140).

Almost surely, 2^400208720903 is an apocalyptic number.

400208720903 is a deficient number, since it is larger than the sum of its proper divisors (3007657).

400208720903 is a wasteful number, since it uses less digits than its factorization.

400208720903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3007656.

The product of its (nonzero) digits is 24192, while the sum is 35.

The spelling of 400208720903 in words is "four hundred billion, two hundred eight million, seven hundred twenty thousand, nine hundred three".