1380411781 has 12 divisors (see below), whose sum is σ = 1700244108. Its totient is φ = 1113608832.

The previous prime is 1380411763. The next prime is 1380411827. The reversal of 1380411781 is 1871140831.

It can be written as a sum of positive squares in 2 ways, for example, as 1210344100 + 170067681 = 34790^2 + 13041^2 .

It is not a de Polignac number, because 1380411781 - 2⁹ = 1380411269 is a prime.

It is a super-2 number, since 2×1380411781² = 3811073370247183922, 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 (1380411751) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 827746 + ... + 829411.

It is an arithmetic number, because the mean of its divisors is an integer number (141687009).

Almost surely, 2^1380411781 is an apocalyptic number.

It is an amenable number.

1380411781 is a deficient number, since it is larger than the sum of its proper divisors (319832327).

1380411781 is a wasteful number, since it uses less digits than its factorization.

1380411781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1657188 (or 1657181 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 34.

The square root of 1380411781 is about 37153.8932145744. The cubic root of 1380411781 is about 1113.4470073991.

The spelling of 1380411781 in words is "one billion, three hundred eighty million, four hundred eleven thousand, seven hundred eighty-one".