1405342840 has 128 divisors (see below), whose sum is σ = 3585669120. Its totient is φ = 491097600.

The previous prime is 1405342823. The next prime is 1405342853. The reversal of 1405342840 is 482435041.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2686819 + ... + 2687341.

It is an arithmetic number, because the mean of its divisors is an integer number (28013040).

Almost surely, 2^1405342840 is an apocalyptic number.

1405342840 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 1405342840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1792834560).

1405342840 is an abundant number, since it is smaller than the sum of its proper divisors (2180326280).

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

1405342840 is a wasteful number, since it uses less digits than its factorization.

1405342840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773 (or 769 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 1405342840 is about 37487.9025820330. The cubic root of 1405342840 is about 1120.1102251212.

Adding to 1405342840 its reverse (482435041), we get a palindrome (1887777881).

The spelling of 1405342840 in words is "one billion, four hundred five million, three hundred forty-two thousand, eight hundred forty".