1421989725 has 48 divisors (see below), whose sum is σ = 2536282112. Its totient is φ = 698837760.

The previous prime is 1421989717. The next prime is 1421989759. The reversal of 1421989725 is 5279891241.

It is a happy number.

It is not a de Polignac number, because 1421989725 - 2³ = 1421989717 is a prime.

It is a congruent number.

It is an unprimeable number.

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 in 47 ways as a sum of consecutive naturals, for example, 854244 + ... + 855906.

Almost surely, 2^1421989725 is an apocalyptic number.

1421989725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1421989725 is a deficient number, since it is larger than the sum of its proper divisors (1114292387).

1421989725 is a wasteful number, since it uses less digits than its factorization.

1421989725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2566 (or 2561 counting only the distinct ones).

The product of its digits is 362880, while the sum is 48.

The square root of 1421989725 is about 37709.2790304986. The cubic root of 1421989725 is about 1124.5156038070.

The spelling of 1421989725 in words is "one billion, four hundred twenty-one million, nine hundred eighty-nine thousand, seven hundred twenty-five".