1969978 has 16 divisors (see below), whose sum is σ = 3047616. Its totient is φ = 954720.

The previous prime is 1969969. The next prime is 1969987. The reversal of 1969978 is 8799691.

It is an interprime number because it is at equal distance from previous prime (1969969) and next prime (1969987).

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14973 + ... + 15103.

It is an arithmetic number, because the mean of its divisors is an integer number (190476).

2^1969978 is an apocalyptic number.

1969978 is a deficient number, since it is larger than the sum of its proper divisors (1077638).

1969978 is a wasteful number, since it uses less digits than its factorization.

1969978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309.

The product of its digits is 244944, while the sum is 49.

The square root of 1969978 is about 1403.5590475644. The cubic root of 1969978 is about 125.3585014971.

The spelling of 1969978 in words is "one million, nine hundred sixty-nine thousand, nine hundred seventy-eight".