1620957379 has 2 divisors, whose sum is σ = 1620957380. Its totient is φ = 1620957378.

The previous prime is 1620957343. The next prime is 1620957433. The reversal of 1620957379 is 9737590261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1620957379 - 2⁷ = 1620957251 is a prime.

It is not a weakly prime, because it can be changed into another prime (1620957319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810478689 + 810478690.

It is an arithmetic number, because the mean of its divisors is an integer number (810478690).

Almost surely, 2^1620957379 is an apocalyptic number.

1620957379 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620957379 is an equidigital number, since it uses as much as digits as its factorization.

1620957379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 714420, while the sum is 49.

The square root of 1620957379 is about 40261.1149746253. The cubic root of 1620957379 is about 1174.6916055595.

The spelling of 1620957379 in words is "one billion, six hundred twenty million, nine hundred fifty-seven thousand, three hundred seventy-nine".