1955978 has 8 divisors (see below), whose sum is σ = 2969568. Its totient is φ = 966124.

The previous prime is 1955977. The next prime is 1955983. The reversal of 1955978 is 8795591.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (1955977) 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, 5726 + ... + 6057.

It is an arithmetic number, because the mean of its divisors is an integer number (371196).

2^1955978 is an apocalyptic number.

1955978 is a deficient number, since it is larger than the sum of its proper divisors (1013590).

1955978 is a wasteful number, since it uses less digits than its factorization.

1955978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11868.

The product of its digits is 113400, while the sum is 44.

The square root of 1955978 is about 1398.5628337690. The cubic root of 1955978 is about 125.0608343886.

It can be divided in two parts, 1955 and 978, that multiplied together give a triangular number (1911990 = T₁₉₅₅).

The spelling of 1955978 in words is "one million, nine hundred fifty-five thousand, nine hundred seventy-eight".