1405381940 has 24 divisors (see below), whose sum is σ = 2959230120. Its totient is φ = 560642688.

The previous prime is 1405381919. The next prime is 1405381951. The reversal of 1405381940 is 491835041.

It can be written as a sum of positive squares in 4 ways, for example, as 537961636 + 867420304 = 23194^2 + 29452^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1405381940.

It is a congruent number.

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, 86735 + ... + 101654.

It is an arithmetic number, because the mean of its divisors is an integer number (123301255).

Almost surely, 2^1405381940 is an apocalyptic number.

1405381940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1405381940 is an abundant number, since it is smaller than the sum of its proper divisors (1553848180).

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

1405381940 is a wasteful number, since it uses less digits than its factorization.

1405381940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188771 (or 188769 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 1405381940 is about 37488.4240799743. The cubic root of 1405381940 is about 1120.1206130736.

The spelling of 1405381940 in words is "one billion, four hundred five million, three hundred eighty-one thousand, nine hundred forty".