1403843455921 has 3 divisors (see below), whose sum is σ = 1403844640761. Its totient is φ = 1403842271082.

The previous prime is 1403843455907. The next prime is 1403843455943. The reversal of 1403843455921 is 1295543483041.

The square root of 1403843455921 is 1184839.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1403843455921 - 2¹⁹ = 1403842931633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1403843455951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 592420 + ... + 1777258.

It is an arithmetic number, because the mean of its divisors is an integer number (467948213587).

Almost surely, 2^{1403843455921} is an apocalyptic number.

1403843455921 is the 1184839-th square number.

1403843455921 is the 592420-th centered octagonal number.

It is an amenable number.

1403843455921 is a deficient number, since it is larger than the sum of its proper divisors (1184840).

1403843455921 is an frugal number, since it uses more digits than its factorization.

1403843455921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2369678 (or 1184839 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 49.

Multiplying 1403843455921 by its sum of digits (49), we get a square (68788329340129 = 8293873²).

The spelling of 1403843455921 in words is "one trillion, four hundred three billion, eight hundred forty-three million, four hundred fifty-five thousand, nine hundred twenty-one".