1380961428 has 192 divisors, whose sum is σ = 4142057472. Its totient is φ = 347742720.

The previous prime is 1380961399. The next prime is 1380961429. The reversal of 1380961428 is 8241690831.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 1380961428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1380961429) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7982350 + ... + 7982522.

It is an arithmetic number, because the mean of its divisors is an integer number (21573216).

Almost surely, 2^1380961428 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 1380961428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2071028736).

1380961428 is an abundant number, since it is smaller than the sum of its proper divisors (2761096044).

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

1380961428 is a wasteful number, since it uses less digits than its factorization.

1380961428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 1380961428 is about 37161.2893748320. The cubic root of 1380961428 is about 1113.5947704568.

The spelling of 1380961428 in words is "one billion, three hundred eighty million, nine hundred sixty-one thousand, four hundred twenty-eight".