1405721420 has 24 divisors (see below), whose sum is σ = 2959467504. Its totient is φ = 560869056.

The previous prime is 1405721419. The next prime is 1405721459. The reversal of 1405721420 is 241275041.

It is a super-3 number, since 3×1405721420³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1405721420.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80582 + ... + 96461.

It is an arithmetic number, because the mean of its divisors is an integer number (123311146).

Almost surely, 2^1405721420 is an apocalyptic number.

1405721420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1405721420 is an abundant number, since it is smaller than the sum of its proper divisors (1553746084).

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

1405721420 is a wasteful number, since it uses less digits than its factorization.

1405721420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177449 (or 177447 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 1405721420 is about 37492.9516042682. The cubic root of 1405721420 is about 1120.2107968452.

Adding to 1405721420 its reverse (241275041), we get a palindrome (1646996461).

The spelling of 1405721420 in words is "one billion, four hundred five million, seven hundred twenty-one thousand, four hundred twenty".