1355678399 has 4 divisors (see below), whose sum is σ = 1402425960. Its totient is φ = 1308930840.

The previous prime is 1355678371. The next prime is 1355678419. The reversal of 1355678399 is 9938765531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9938765531 = 241 ⋅41239691.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1355678399 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 (1355678099) 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, 23373737 + ... + 23373794.

It is an arithmetic number, because the mean of its divisors is an integer number (350606490).

Almost surely, 2^1355678399 is an apocalyptic number.

1355678399 is a deficient number, since it is larger than the sum of its proper divisors (46747561).

1355678399 is an equidigital number, since it uses as much as digits as its factorization.

1355678399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46747560.

The product of its digits is 6123600, while the sum is 56.

The square root of 1355678399 is about 36819.5382779306. The cubic root of 1355678399 is about 1106.7568672648.

The spelling of 1355678399 in words is "one billion, three hundred fifty-five million, six hundred seventy-eight thousand, three hundred ninety-nine".