1405006644 has 12 divisors (see below), whose sum is σ = 3278348864. Its totient is φ = 468335544.

The previous prime is 1405006619. The next prime is 1405006649. The reversal of 1405006644 is 4466005041.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1405006649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58541932 + ... + 58541955.

Almost surely, 2^1405006644 is an apocalyptic number.

It is an amenable number.

1405006644 is an abundant number, since it is smaller than the sum of its proper divisors (1873342220).

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

1405006644 is a wasteful number, since it uses less digits than its factorization.

1405006644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117083894 (or 117083892 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 1405006644 is about 37483.4182539426. The cubic root of 1405006644 is about 1120.0208977818.

The spelling of 1405006644 in words is "one billion, four hundred five million, six thousand, six hundred forty-four".