1386961920 has 352 divisors, whose sum is σ = 5030707200. Its totient is φ = 362299392.

The previous prime is 1386961907. The next prime is 1386961973. The reversal of 1386961920 is 291696831.

It is a happy number.

1386961920 is a `hidden beast` number, since 1 + 3 + 8 + 6 + 9 + 619 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10920897 + ... + 10921023.

Almost surely, 2^1386961920 is an apocalyptic number.

1386961920 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 1386961920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2515353600).

1386961920 is an abundant number, since it is smaller than the sum of its proper divisors (3643745280).

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

1386961920 is a wasteful number, since it uses less digits than its factorization.

1386961920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 1386961920 is about 37241.9376509870. The cubic root of 1386961920 is about 1115.2053540675.

The spelling of 1386961920 in words is "one billion, three hundred eighty-six million, nine hundred sixty-one thousand, nine hundred twenty".