1405721416 has 32 divisors (see below), whose sum is σ = 2880751680. Its totient is φ = 637761600.

The previous prime is 1405721389. The next prime is 1405721417. The reversal of 1405721416 is 6141275041.

It is a super-3 number, since 3×1405721416³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1405721417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32845 + ... + 62371.

It is an arithmetic number, because the mean of its divisors is an integer number (90023490).

Almost surely, 2^1405721416 is an apocalyptic number.

It is an amenable number.

1405721416 is an abundant number, since it is smaller than the sum of its proper divisors (1475030264).

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

1405721416 is a wasteful number, since it uses less digits than its factorization.

1405721416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30085 (or 30081 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 1405721416 is about 37492.9515509249. The cubic root of 1405721416 is about 1120.2107957827.

Adding to 1405721416 its reverse (6141275041), we get a palindrome (7546996457).

The spelling of 1405721416 in words is "one billion, four hundred five million, seven hundred twenty-one thousand, four hundred sixteen".