1421399477 has 2 divisors, whose sum is σ = 1421399478. Its totient is φ = 1421399476.

The previous prime is 1421399467. The next prime is 1421399513. The reversal of 1421399477 is 7749931241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 741963121 + 679436356 = 27239^2 + 26066^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421399477 - 2²² = 1417205173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1421399467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710699738 + 710699739.

It is an arithmetic number, because the mean of its divisors is an integer number (710699739).

Almost surely, 2^1421399477 is an apocalyptic number.

It is an amenable number.

1421399477 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421399477 is an equidigital number, since it uses as much as digits as its factorization.

1421399477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 47.

The square root of 1421399477 is about 37701.4519216435. The cubic root of 1421399477 is about 1124.3599920534.

The spelling of 1421399477 in words is "one billion, four hundred twenty-one million, three hundred ninety-nine thousand, four hundred seventy-seven".