403490473681 has 5 divisors (see below), whose sum is σ = 403997371261. Its totient is φ = 402984212108.

The previous prime is 403490473667. The next prime is 403490473691. The reversal of 403490473681 is 186374094304.

The square root of 403490473681 is 635209.

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

It can be written as a sum of positive squares in 2 ways, for example, as 367067281 + 403123406400 = 19159^2 + 634920^2 .

It is not a de Polignac number, because 403490473681 - 2¹¹ = 403490471633 is a prime.

It is a super-2 number, since 2×403490473681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (403490473601) by changing a digit.

It is a polite number, since it can be written in 4 ways as a sum of consecutive naturals, for example, 506261175 + ... + 506261971.

Almost surely, 2^403490473681 is an apocalyptic number.

403490473681 is the 635209-th square number.

403490473681 is the 317605-th centered octagonal number.

It is an amenable number.

403490473681 is a deficient number, since it is larger than the sum of its proper divisors (506897580).

403490473681 is an frugal number, since it uses more digits than its factorization.

403490473681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3188 (or 797 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 49.

Multiplying 403490473681 by its sum of digits (49), we get a square (19771033210369 = 4446463²).

The spelling of 403490473681 in words is "four hundred three billion, four hundred ninety million, four hundred seventy-three thousand, six hundred eighty-one".