1398128007 has 8 divisors (see below), whose sum is σ = 1864465776. Its totient is φ = 931937792.

The previous prime is 1398127963. The next prime is 1398128033. The reversal of 1398128007 is 7008218931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1398128007 - 2⁶ = 1398127943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398128057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12468 + ... + 54329.

It is an arithmetic number, because the mean of its divisors is an integer number (233058222).

Almost surely, 2^1398128007 is an apocalyptic number.

1398128007 is a deficient number, since it is larger than the sum of its proper divisors (466337769).

1398128007 is an equidigital number, since it uses as much as digits as its factorization.

1398128007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73777.

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 1398128007 is about 37391.5499411297. The cubic root of 1398128007 is about 1118.1901058994.

The spelling of 1398128007 in words is "one billion, three hundred ninety-eight million, one hundred twenty-eight thousand, seven".