1916639 has 12 divisors (see below), whose sum is σ = 2069496. Its totient is φ = 1773408.

The previous prime is 1916633. The next prime is 1916641. The reversal of 1916639 is 9366191.

1916639 = T₂₄₂ + T₂₄₃ + ... + T₂₉₄.

It is not a de Polignac number, because 1916639 - 2¹² = 1912543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1916599 and 1916608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1916633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36137 + ... + 36189.

It is an arithmetic number, because the mean of its divisors is an integer number (172458).

2^1916639 is an apocalyptic number.

1916639 is a deficient number, since it is larger than the sum of its proper divisors (152857).

1916639 is an equidigital number, since it uses as much as digits as its factorization.

1916639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154 (or 125 counting only the distinct ones).

The product of its digits is 8748, while the sum is 35.

The square root of 1916639 is about 1384.4273184245. The cubic root of 1916639 is about 124.2167342091.

The spelling of 1916639 in words is "one million, nine hundred sixteen thousand, six hundred thirty-nine".