1957978 has 16 divisors (see below), whose sum is σ = 3258720. Its totient is φ = 874800.

The previous prime is 1957957. The next prime is 1957981. The reversal of 1957978 is 8797591.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 613 + ... + 2071.

It is an arithmetic number, because the mean of its divisors is an integer number (203670).

2^1957978 is an apocalyptic number.

1957978 is a deficient number, since it is larger than the sum of its proper divisors (1300742).

1957978 is a wasteful number, since it uses less digits than its factorization.

1957978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1533.

The product of its digits is 158760, while the sum is 46.

The square root of 1957978 is about 1399.2776708002. The cubic root of 1957978 is about 125.1034450360.

It can be divided in two parts, 1957 and 978, that multiplied together give a triangular number (1913946 = T₁₉₅₆).

The spelling of 1957978 in words is "one million, nine hundred fifty-seven thousand, nine hundred seventy-eight".