1071639 has 24 divisors (see below), whose sum is σ = 1677312. Its totient is φ = 657360.

The previous prime is 1071601. The next prime is 1071641. The reversal of 1071639 is 9361701.

It is not a de Polignac number, because 1071639 - 2¹¹ = 1069591 is a prime.

It is a super-2 number, since 2×1071639² = 2296820292642, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1071659) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6334 + ... + 6500.

It is an arithmetic number, because the mean of its divisors is an integer number (69888).

2^1071639 is an apocalyptic number.

1071639 is a deficient number, since it is larger than the sum of its proper divisors (605673).

1071639 is a wasteful number, since it uses less digits than its factorization.

1071639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 27.

The square root of 1071639 is about 1035.1999806801. The cubic root of 1071639 is about 102.3331093399. Note that the first 3 decimals are identical.

The spelling of 1071639 in words is "one million, seventy-one thousand, six hundred thirty-nine".