403960861 has 2 divisors, whose sum is σ = 403960862. Its totient is φ = 403960860.

The previous prime is 403960841. The next prime is 403960871. The reversal of 403960861 is 168069304.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 316163961 + 87796900 = 17781^2 + 9370^2 .

It is a cyclic number.

It is not a de Polignac number, because 403960861 - 2⁵ = 403960829 is a prime.

It is a super-2 number, since 2×403960861² = 326368754439722642, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 403960861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (403960841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201980430 + 201980431.

It is an arithmetic number, because the mean of its divisors is an integer number (201980431).

Almost surely, 2^403960861 is an apocalyptic number.

It is an amenable number.

403960861 is a deficient number, since it is larger than the sum of its proper divisors (1).

403960861 is an equidigital number, since it uses as much as digits as its factorization.

403960861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 403960861 is about 20098.7775996452. Note that the first 3 decimals coincide. The cubic root of 403960861 is about 739.2303057360.

The spelling of 403960861 in words is "four hundred three million, nine hundred sixty thousand, eight hundred sixty-one".