1403020440 has 160 divisors (see below), whose sum is σ = 4745774880. Its totient is φ = 371755008.

The previous prime is 1403020433. The next prime is 1403020457. The reversal of 1403020440 is 440203041.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 539784 + ... + 542376.

It is an arithmetic number, because the mean of its divisors is an integer number (29661093).

Almost surely, 2^1403020440 is an apocalyptic number.

1403020440 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 1403020440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2372887440).

1403020440 is an abundant number, since it is smaller than the sum of its proper divisors (3342754440).

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

1403020440 is a wasteful number, since it uses less digits than its factorization.

1403020440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2783 (or 2770 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 1403020440 is about 37456.9144484700. The cubic root of 1403020440 is about 1119.4928720264.

Adding to 1403020440 its reverse (440203041), we get a palindrome (1843223481).

The spelling of 1403020440 in words is "one billion, four hundred three million, twenty thousand, four hundred forty".