1620923 has 2 divisors, whose sum is σ = 1620924. Its totient is φ = 1620922.

The previous prime is 1620917. The next prime is 1620929. The reversal of 1620923 is 3290261.

It is a balanced prime because it is at equal distance from previous prime (1620917) and next prime (1620929).

It is a cyclic number.

It is not a de Polignac number, because 1620923 - 2⁸ = 1620667 is a prime.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (1620929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810461 + 810462.

It is an arithmetic number, because the mean of its divisors is an integer number (810462).

2^1620923 is an apocalyptic number.

1620923 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620923 is an equidigital number, since it uses as much as digits as its factorization.

1620923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 1620923 is about 1273.1547431479. The cubic root of 1620923 is about 117.4683300795.

Subtracting from 1620923 its sum of digits (23), we obtain a triangular number (1620900 = T₁₈₀₀).

The spelling of 1620923 in words is "one million, six hundred twenty thousand, nine hundred twenty-three".