1630399 has 2 divisors, whose sum is σ = 1630400. Its totient is φ = 1630398.

The previous prime is 1630393. The next prime is 1630403. The reversal of 1630399 is 9930361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1630399 - 2⁵ = 1630367 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1630399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1630393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815199 + 815200.

It is an arithmetic number, because the mean of its divisors is an integer number (815200).

2^1630399 is an apocalyptic number.

1630399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1630399 is an equidigital number, since it uses as much as digits as its factorization.

1630399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 31.

The square root of 1630399 is about 1276.8707843787. The cubic root of 1630399 is about 117.6967941038.

It can be divided in two parts, 1630 and 399, that multiplied together give a triangular number (650370 = T₁₁₄₀).

The spelling of 1630399 in words is "one million, six hundred thirty thousand, three hundred ninety-nine".