155943978 has 8 divisors (see below), whose sum is σ = 311887968. Its totient is φ = 51981324.

The previous prime is 155943971. The next prime is 155944007. The reversal of 155943978 is 879349551.

It is a sphenic number, since it is the product of 3 distinct primes.

155943978 is an admirable number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 155943978.

It is not an unprimeable number, because it can be changed into a prime (155943971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12995326 + ... + 12995337.

It is an arithmetic number, because the mean of its divisors is an integer number (38985996).

Almost surely, 2^155943978 is an apocalyptic number.

155943978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

155943978 is a wasteful number, since it uses less digits than its factorization.

155943978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25990668.

The product of its digits is 1360800, while the sum is 51.

The square root of 155943978 is about 12487.7531205578. The cubic root of 155943978 is about 538.2568136778.

The spelling of 155943978 in words is "one hundred fifty-five million, nine hundred forty-three thousand, nine hundred seventy-eight".