1380400861 has 8 divisors (see below), whose sum is σ = 1580022144. Its totient is φ = 1181384880.

The previous prime is 1380400859. The next prime is 1380400883. The reversal of 1380400861 is 1680040831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1380400861 - 2¹ = 1380400859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1380400831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146425 + ... + 155566.

It is an arithmetic number, because the mean of its divisors is an integer number (197502768).

Almost surely, 2^1380400861 is an apocalyptic number.

It is an amenable number.

1380400861 is a deficient number, since it is larger than the sum of its proper divisors (199621283).

1380400861 is an equidigital number, since it uses as much as digits as its factorization.

1380400861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302651.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 1380400861 is about 37153.7462579482. The cubic root of 1380400861 is about 1113.4440713493. Note that the first 3 decimals are identical.

The spelling of 1380400861 in words is "one billion, three hundred eighty million, four hundred thousand, eight hundred sixty-one".