1349429778 has 24 divisors (see below), whose sum is σ = 2930533788. Its totient is φ = 448768512.

The previous prime is 1349429777. The next prime is 1349429779. The reversal of 1349429778 is 8779249431.

1349429778 is a `hidden beast` number, since 1 + 349 + 4 + 297 + 7 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (1349429777) and next prime (1349429779).

It can be written as a sum of positive squares in 2 ways, for example, as 1319650929 + 29778849 = 36327^2 + 5457^2 .

It is not an unprimeable number, because it can be changed into a prime (1349429777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78775 + ... + 94362.

Almost surely, 2^1349429778 is an apocalyptic number.

1349429778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1349429778 is an abundant number, since it is smaller than the sum of its proper divisors (1581104010).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1349429778 is a wasteful number, since it uses less digits than its factorization.

1349429778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173578 (or 173575 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The square root of 1349429778 is about 36734.5855836159. The cubic root of 1349429778 is about 1105.0538190995.

The spelling of 1349429778 in words is "one billion, three hundred forty-nine million, four hundred twenty-nine thousand, seven hundred seventy-eight".