1399125420 has 864 divisors, whose sum is σ = 6113318400. Its totient is φ = 263450880.

The previous prime is 1399125383. The next prime is 1399125487. The reversal of 1399125420 is 245219931.

1399125420 is a `hidden beast` number, since 13 + 99 + 12 + 542 + 0 = 666.

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

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 60831529 + ... + 60831551.

It is an arithmetic number, because the mean of its divisors is an integer number (7075600).

Almost surely, 2^1399125420 is an apocalyptic number.

1399125420 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 1399125420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3056659200).

1399125420 is an abundant number, since it is smaller than the sum of its proper divisors (4714192980).

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

1399125420 is a wasteful number, since it uses less digits than its factorization.

1399125420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96 (or 70 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 1399125420 is about 37404.8849750938. The cubic root of 1399125420 is about 1118.4559452296.

The spelling of 1399125420 in words is "one billion, three hundred ninety-nine million, one hundred twenty-five thousand, four hundred twenty".