1408139280 has 120 divisors (see below), whose sum is σ = 4759504152. Its totient is φ = 373082112.

The previous prime is 1408139279. The next prime is 1408139309. The reversal of 1408139280 is 829318041.

It can be written as a sum of positive squares in 4 ways, for example, as 204604416 + 1203534864 = 14304^2 + 34692^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106812 + ... + 119268.

Almost surely, 2^1408139280 is an apocalyptic number.

1408139280 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 1408139280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2379752076).

1408139280 is an abundant number, since it is smaller than the sum of its proper divisors (3351364872).

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

1408139280 is a wasteful number, since it uses less digits than its factorization.

1408139280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12633 (or 12624 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1408139280 is about 37525.1819449287. The cubic root of 1408139280 is about 1120.8526882442.

It can be divided in two parts, 14081 and 39280, that added together give a square (53361 = 231²).

The spelling of 1408139280 in words is "one billion, four hundred eight million, one hundred thirty-nine thousand, two hundred eighty".