1421998405 has 8 divisors (see below), whose sum is σ = 1806774552. Its totient is φ = 1070681088.

The previous prime is 1421998397. The next prime is 1421998421. The reversal of 1421998405 is 5048991241.

It can be written as a sum of positive squares in 4 ways, for example, as 108805761 + 1313192644 = 10431^2 + 36238^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1421998405 - 2³ = 1421998397 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8364612 + ... + 8364781.

It is an arithmetic number, because the mean of its divisors is an integer number (225846819).

Almost surely, 2^1421998405 is an apocalyptic number.

It is an amenable number.

1421998405 is a deficient number, since it is larger than the sum of its proper divisors (384776147).

1421998405 is a wasteful number, since it uses less digits than its factorization.

1421998405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16729415.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 1421998405 is about 37709.3941213592. The cubic root of 1421998405 is about 1124.5178918628.

The spelling of 1421998405 in words is "one billion, four hundred twenty-one million, nine hundred ninety-eight thousand, four hundred five".