146139878 has 4 divisors (see below), whose sum is σ = 219209820. Its totient is φ = 73069938.

The previous prime is 146139857. The next prime is 146139893. The reversal of 146139878 is 878931641.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36534968 + ... + 36534971.

It is an arithmetic number, because the mean of its divisors is an integer number (54802455).

Almost surely, 2^146139878 is an apocalyptic number.

146139878 is a deficient number, since it is larger than the sum of its proper divisors (73069942).

146139878 is an equidigital number, since it uses as much as digits as its factorization.

146139878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73069941.

The product of its digits is 290304, while the sum is 47.

The square root of 146139878 is about 12088.8327807113. The cubic root of 146139878 is about 526.7318505195.

The spelling of 146139878 in words is "one hundred forty-six million, one hundred thirty-nine thousand, eight hundred seventy-eight".