1977623 has 2 divisors, whose sum is σ = 1977624. Its totient is φ = 1977622.

The previous prime is 1977617. The next prime is 1977631. The reversal of 1977623 is 3267791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1977623 - 2¹⁰ = 1976599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1977673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 988811 + 988812.

It is an arithmetic number, because the mean of its divisors is an integer number (988812).

2^1977623 is an apocalyptic number.

1977623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1977623 is an equidigital number, since it uses as much as digits as its factorization.

1977623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15876, while the sum is 35.

The square root of 1977623 is about 1406.2798441278. The cubic root of 1977623 is about 125.5204540135.

The spelling of 1977623 in words is "one million, nine hundred seventy-seven thousand, six hundred twenty-three".