1961977 has 4 divisors (see below), whose sum is σ = 1976436. Its totient is φ = 1947520.

The previous prime is 1961963. The next prime is 1961983. The reversal of 1961977 is 7791691.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 434281 + 1527696 = 659^2 + 1236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1961977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1961917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7024 + ... + 7297.

It is an arithmetic number, because the mean of its divisors is an integer number (494109).

2^1961977 is an apocalyptic number.

It is an amenable number.

1961977 is a deficient number, since it is larger than the sum of its proper divisors (14459).

1961977 is a wasteful number, since it uses less digits than its factorization.

1961977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14458.

The product of its digits is 23814, while the sum is 40.

The square root of 1961977 is about 1400.7058934694. The cubic root of 1961977 is about 125.1885580904.

The spelling of 1961977 in words is "one million, nine hundred sixty-one thousand, nine hundred seventy-seven".