1421856644 has 12 divisors (see below), whose sum is σ = 2679653004. Its totient is φ = 656241504.

The previous prime is 1421856593. The next prime is 1421856679. The reversal of 1421856644 is 4466581241.

It can be written as a sum of positive squares in 2 ways, for example, as 83028544 + 1338828100 = 9112^2 + 36590^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13671647 + ... + 13671750.

It is an arithmetic number, because the mean of its divisors is an integer number (223304417).

Almost surely, 2^1421856644 is an apocalyptic number.

It is an amenable number.

1421856644 is a deficient number, since it is larger than the sum of its proper divisors (1257796360).

1421856644 is a wasteful number, since it uses less digits than its factorization.

1421856644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27343414 (or 27343412 counting only the distinct ones).

The product of its digits is 184320, while the sum is 41.

The square root of 1421856644 is about 37707.5144235204. The cubic root of 1421856644 is about 1124.4805223698.

The spelling of 1421856644 in words is "one billion, four hundred twenty-one million, eight hundred fifty-six thousand, six hundred forty-four".