155854978 has 4 divisors (see below), whose sum is σ = 233782470. Its totient is φ = 77927488.

The previous prime is 155854973. The next prime is 155855039. The reversal of 155854978 is 879458551.

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

It can be written as a sum of positive squares in only one way, i.e., 130119649 + 25735329 = 11407^2 + 5073^2 .

It is not an unprimeable number, because it can be changed into a prime (155854973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38963743 + ... + 38963746.

Almost surely, 2^155854978 is an apocalyptic number.

155854978 is a deficient number, since it is larger than the sum of its proper divisors (77927492).

155854978 is an equidigital number, since it uses as much as digits as its factorization.

155854978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77927491.

The product of its digits is 2016000, while the sum is 52.

The square root of 155854978 is about 12484.1891206438. The cubic root of 155854978 is about 538.1543966148.

The spelling of 155854978 in words is "one hundred fifty-five million, eight hundred fifty-four thousand, nine hundred seventy-eight".