1601978 has 32 divisors (see below), whose sum is σ = 2985984. Its totient is φ = 628992.

The previous prime is 1601969. The next prime is 1602011. The reversal of 1601978 is 8791061.

It is a super-3 number, since 3×1601978³ = 12333629482986280056, which contains 333 as substring.

It is a Curzon number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 12551 + ... + 12677.

It is an arithmetic number, because the mean of its divisors is an integer number (93312).

2^1601978 is an apocalyptic number.

1601978 is a deficient number, since it is larger than the sum of its proper divisors (1384006).

1601978 is a wasteful number, since it uses less digits than its factorization.

1601978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 1601978 is about 1265.6926957204. The cubic root of 1601978 is about 117.0088872398.

The spelling of 1601978 in words is "one million, six hundred one thousand, nine hundred seventy-eight".