1408391864 has 16 divisors (see below), whose sum is σ = 2880801720. Its totient is φ = 640178080.

The previous prime is 1408391863. The next prime is 1408391899. The reversal of 1408391864 is 4681938041.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1408391863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8002139 + ... + 8002314.

Almost surely, 2^1408391864 is an apocalyptic number.

It is an amenable number.

1408391864 is an abundant number, since it is smaller than the sum of its proper divisors (1472409856).

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

1408391864 is a wasteful number, since it uses less digits than its factorization.

1408391864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16004470 (or 16004466 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 1408391864 is about 37528.5473206731. The cubic root of 1408391864 is about 1120.9197016269.

The spelling of 1408391864 in words is "one billion, four hundred eight million, three hundred ninety-one thousand, eight hundred sixty-four".