1380328261 has 4 divisors (see below), whose sum is σ = 1486507372. Its totient is φ = 1274149152.

The previous prime is 1380328247. The next prime is 1380328307. The reversal of 1380328261 is 1628230831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 415915236 + 964413025 = 20394^2 + 31055^2 .

It is a cyclic number.

It is not a de Polignac number, because 1380328261 - 2⁷ = 1380328133 is a prime.

It is a super-2 number, since 2×1380328261² = 3810612216230568242, 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 (1380328361) 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, 53089536 + ... + 53089561.

It is an arithmetic number, because the mean of its divisors is an integer number (371626843).

Almost surely, 2^1380328261 is an apocalyptic number.

It is an amenable number.

1380328261 is a deficient number, since it is larger than the sum of its proper divisors (106179111).

1380328261 is a wasteful number, since it uses less digits than its factorization.

1380328261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106179110.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 1380328261 is about 37152.7692238412. The cubic root of 1380328261 is about 1113.4245510638.

The spelling of 1380328261 in words is "one billion, three hundred eighty million, three hundred twenty-eight thousand, two hundred sixty-one".