1355780391 has 8 divisors (see below), whose sum is σ = 2065951104. Its totient is φ = 774731640.

The previous prime is 1355780389. The next prime is 1355780423. The reversal of 1355780391 is 1930875531.

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

It is not a de Polignac number, because 1355780391 - 2¹ = 1355780389 is a prime.

It is a super-2 number, since 2×1355780391² = 3676280937240225762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355780351) 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, 32280465 + ... + 32280506.

It is an arithmetic number, because the mean of its divisors is an integer number (258243888).

Almost surely, 2^1355780391 is an apocalyptic number.

1355780391 is a deficient number, since it is larger than the sum of its proper divisors (710170713).

1355780391 is an equidigital number, since it uses as much as digits as its factorization.

1355780391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64560981.

The product of its (nonzero) digits is 113400, while the sum is 42.

The square root of 1355780391 is about 36820.9232773976. The cubic root of 1355780391 is about 1106.7846215158.

The spelling of 1355780391 in words is "one billion, three hundred fifty-five million, seven hundred eighty thousand, three hundred ninety-one".