1620977 has 2 divisors, whose sum is σ = 1620978. Its totient is φ = 1620976.

The previous prime is 1620973. The next prime is 1620989. The reversal of 1620977 is 7790261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1547536 + 73441 = 1244^2 + 271^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620977 - 2² = 1620973 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1620973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810488 + 810489.

It is an arithmetic number, because the mean of its divisors is an integer number (810489).

2^1620977 is an apocalyptic number.

It is an amenable number.

1620977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620977 is an equidigital number, since it uses as much as digits as its factorization.

1620977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 1620977 is about 1273.1759501342. The cubic root of 1620977 is about 117.4696345255.

The spelling of 1620977 in words is "one million, six hundred twenty thousand, nine hundred seventy-seven".