155978007 has 16 divisors (see below), whose sum is σ = 213138432. Its totient is φ = 101417120.

The previous prime is 155978003. The next prime is 155978027. The reversal of 155978007 is 700879551.

It is a cyclic number.

It is not a de Polignac number, because 155978007 - 2² = 155978003 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155978007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155978003) 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 15 ways as a sum of consecutive naturals, for example, 42073 + ... + 45629.

It is an arithmetic number, because the mean of its divisors is an integer number (13321152).

Almost surely, 2^155978007 is an apocalyptic number.

155978007 is a deficient number, since it is larger than the sum of its proper divisors (57160425).

155978007 is a wasteful number, since it uses less digits than its factorization.

155978007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3918.

The product of its (nonzero) digits is 88200, while the sum is 42.

The square root of 155978007 is about 12489.1155411422. The cubic root of 155978007 is about 538.2959623713.

The spelling of 155978007 in words is "one hundred fifty-five million, nine hundred seventy-eight thousand, seven".