1400001408 has 480 divisors, whose sum is σ = 4878545760. Its totient is φ = 396804096.

The previous prime is 1400001401. The next prime is 1400001443. The reversal of 1400001408 is 8041000041.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1400001401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 29787241 + ... + 29787287.

It is an arithmetic number, because the mean of its divisors is an integer number (10163637).

Almost surely, 2^1400001408 is an apocalyptic number.

1400001408 is a gapful number since it is divisible by the number (18) 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 1400001408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2439272880).

1400001408 is an abundant number, since it is smaller than the sum of its proper divisors (3478544352).

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

1400001408 is a wasteful number, since it uses less digits than its factorization.

1400001408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1400001408 is about 37416.5926829261. The cubic root of 1400001408 is about 1118.6893171084.

Adding to 1400001408 its reverse (8041000041), we get a palindrome (9441001449).

The spelling of 1400001408 in words is "one billion, four hundred million, one thousand, four hundred eight".