1421644896 has 72 divisors (see below), whose sum is σ = 4620352464. Its totient is φ = 406183680.

The previous prime is 1421644877. The next prime is 1421644933. The reversal of 1421644896 is 6984461241.

1421644896 is a `hidden beast` number, since 1 + 4 + 2 + 164 + 489 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 350575 + ... + 354606.

It is an arithmetic number, because the mean of its divisors is an integer number (64171562).

Almost surely, 2^1421644896 is an apocalyptic number.

1421644896 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1421644896 is an abundant number, since it is smaller than the sum of its proper divisors (3198707568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1421644896 is a wasteful number, since it uses less digits than its factorization.

1421644896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705204 (or 705193 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 1421644896 is about 37704.7065497134. The cubic root of 1421644896 is about 1124.4246990387.

It can be divided in two parts, 14 and 21644896, that added together give a triangular number (21644910 = T₆₅₇₉).

The spelling of 1421644896 in words is "one billion, four hundred twenty-one million, six hundred forty-four thousand, eight hundred ninety-six".