1403400421 has 2 divisors, whose sum is σ = 1403400422. Its totient is φ = 1403400420.

The previous prime is 1403400359. The next prime is 1403400461. The reversal of 1403400421 is 1240043041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 847101025 + 556299396 = 29105^2 + 23586^2 .

It is a cyclic number.

It is not a de Polignac number, because 1403400421 - 2¹³ = 1403392229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1403400461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 701700210 + 701700211.

It is an arithmetic number, because the mean of its divisors is an integer number (701700211).

Almost surely, 2^1403400421 is an apocalyptic number.

It is an amenable number.

1403400421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1403400421 is an equidigital number, since it uses as much as digits as its factorization.

1403400421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1403400421 is about 37461.9863461616. The cubic root of 1403400421 is about 1119.5939272480.

Adding to 1403400421 its reverse (1240043041), we get a palindrome (2643443462).

The spelling of 1403400421 in words is "one billion, four hundred three million, four hundred thousand, four hundred twenty-one".