378779139 has 16 divisors (see below), whose sum is σ = 563235840. Its totient is φ = 251582760.

The previous prime is 378779129. The next prime is 378779147. The reversal of 378779139 is 931977873.

It is a happy number.

It is not a de Polignac number, because 378779139 - 2¹² = 378775043 is a prime.

It is a super-2 number, since 2×378779139² = 286947272283162642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (378779129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18567 + ... + 33200.

It is an arithmetic number, because the mean of its divisors is an integer number (35202240).

Almost surely, 2^378779139 is an apocalyptic number.

378779139 is a deficient number, since it is larger than the sum of its proper divisors (184456701).

378779139 is a wasteful number, since it uses less digits than its factorization.

378779139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52047 (or 52041 counting only the distinct ones).

The product of its digits is 2000376, while the sum is 54.

The square root of 378779139 is about 19462.2490735269. The cubic root of 378779139 is about 723.5391202847.

The spelling of 378779139 in words is "three hundred seventy-eight million, seven hundred seventy-nine thousand, one hundred thirty-nine".