1385401944 has 64 divisors (see below), whose sum is σ = 3681469440. Its totient is φ = 432949760.

The previous prime is 1385401943. The next prime is 1385402003. The reversal of 1385401944 is 4491045831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1385401943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100849 + ... + 113759.

It is an arithmetic number, because the mean of its divisors is an integer number (57522960).

Almost surely, 2^1385401944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1385401944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1840734720).

1385401944 is an abundant number, since it is smaller than the sum of its proper divisors (2296067496).

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

1385401944 is a wasteful number, since it uses less digits than its factorization.

1385401944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13200 (or 13196 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 1385401944 is about 37220.9879503487. The cubic root of 1385401944 is about 1114.7870906659.

The spelling of 1385401944 in words is "one billion, three hundred eighty-five million, four hundred one thousand, nine hundred forty-four".