1406343640 has 80 divisors (see below), whose sum is σ = 3430738080. Its totient is φ = 518843520.

The previous prime is 1406343623. The next prime is 1406343643. The reversal of 1406343640 is 463436041.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1406343643) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1141825 + ... + 1143055.

It is an arithmetic number, because the mean of its divisors is an integer number (42884226).

Almost surely, 2^1406343640 is an apocalyptic number.

1406343640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1406343640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1715369040).

1406343640 is an abundant number, since it is smaller than the sum of its proper divisors (2024394440).

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

1406343640 is an equidigital number, since it uses as much as digits as its factorization.

1406343640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294 (or 1251 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 1406343640 is about 37501.2485125496. The cubic root of 1406343640 is about 1120.3760535683.

Adding to 1406343640 its reverse (463436041), we get a palindrome (1869779681).

The spelling of 1406343640 in words is "one billion, four hundred six million, three hundred forty-three thousand, six hundred forty".