1380280381 has 4 divisors (see below), whose sum is σ = 1380370012. Its totient is φ = 1380190752.

The previous prime is 1380280379. The next prime is 1380280387. The reversal of 1380280381 is 1830820831.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 159896025 + 1220384356 = 12645^2 + 34934^2 .

It is a cyclic number.

It is not a de Polignac number, because 1380280381 - 2¹ = 1380280379 is a prime.

It is a super-2 number, since 2×1380280381² = 3810347860347010322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1380280387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15186 + ... + 54691.

It is an arithmetic number, because the mean of its divisors is an integer number (345092503).

Almost surely, 2^1380280381 is an apocalyptic number.

It is an amenable number.

1380280381 is a deficient number, since it is larger than the sum of its proper divisors (89631).

1380280381 is an equidigital number, since it uses as much as digits as its factorization.

1380280381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89630.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 1380280381 is about 37152.1248517497. The cubic root of 1380280381 is about 1113.4116769802.

The spelling of 1380280381 in words is "one billion, three hundred eighty million, two hundred eighty thousand, three hundred eighty-one".