1355240391 has 8 divisors (see below), whose sum is σ = 1913280624. Its totient is φ = 850346880.

The previous prime is 1355240387. The next prime is 1355240407. The reversal of 1355240391 is 1930425531.

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

It is not a de Polignac number, because 1355240391 - 2² = 1355240387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355240311) 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, 13286620 + ... + 13286721.

It is an arithmetic number, because the mean of its divisors is an integer number (239160078).

Almost surely, 2^1355240391 is an apocalyptic number.

1355240391 is a deficient number, since it is larger than the sum of its proper divisors (558040233).

1355240391 is a wasteful number, since it uses less digits than its factorization.

1355240391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26573361.

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 1355240391 is about 36813.5897597613. The cubic root of 1355240391 is about 1106.6376598924.

The spelling of 1355240391 in words is "one billion, three hundred fifty-five million, two hundred forty thousand, three hundred ninety-one".