1385477940 has 144 divisors (see below), whose sum is σ = 4923059904. Its totient is φ = 287884800.

The previous prime is 1385477927. The next prime is 1385477941. The reversal of 1385477940 is 497745831.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1385477940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1385477941) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10920 + ... + 53760.

It is an arithmetic number, because the mean of its divisors is an integer number (34187916).

Almost surely, 2^1385477940 is an apocalyptic number.

1385477940 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 1385477940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2461529952).

1385477940 is an abundant number, since it is smaller than the sum of its proper divisors (3537581964).

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

1385477940 is a wasteful number, since it uses less digits than its factorization.

1385477940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42878 (or 42869 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 48.

The square root of 1385477940 is about 37222.0088119919. The cubic root of 1385477940 is about 1114.8074741152.

The spelling of 1385477940 in words is "one billion, three hundred eighty-five million, four hundred seventy-seven thousand, nine hundred forty".