403940493842 has 6 divisors (see below), whose sum is σ = 605912088999. Its totient is φ = 201969797510.

The previous prime is 403940493821. The next prime is 403940493851. The reversal of 403940493842 is 248394049304.

It can be written as a sum of positive squares in only one way, i.e., 201970246921 + 201970246921 = 449411^2 + 449411^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=449411.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 674117 + ... + 1123527.

Almost surely, 2^403940493842 is an apocalyptic number.

403940493842 is a deficient number, since it is larger than the sum of its proper divisors (201971595157).

403940493842 is an frugal number, since it uses more digits than its factorization.

403940493842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898824 (or 449413 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 50.

Multiplying 403940493842 by its sum of digits (50), we get a square (20197024692100 = 4494110²).

The spelling of 403940493842 in words is "four hundred three billion, nine hundred forty million, four hundred ninety-three thousand, eight hundred forty-two".