1285641 has 12 divisors (see below), whose sum is σ = 2122432. Its totient is φ = 734616.

The previous prime is 1285633. The next prime is 1285649. The reversal of 1285641 is 1465821.

1285641 = T₂₉₅ + T₂₉₆ + ... + T₃₂₁.

1285641 is a `hidden beast` number, since 12 + 8 + 5 + 641 = 666.

It is an interprime number because it is at equal distance from previous prime (1285633) and next prime (1285649).

It is not a de Polignac number, because 1285641 - 2³ = 1285633 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1285649) 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, 10141 + ... + 10266.

2^1285641 is an apocalyptic number.

It is an amenable number.

1285641 is a deficient number, since it is larger than the sum of its proper divisors (836791).

1285641 is a wasteful number, since it uses less digits than its factorization.

1285641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20420 (or 20417 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 1285641 is about 1133.8611026047. The cubic root of 1285641 is about 108.7359712383.

The spelling of 1285641 in words is "one million, two hundred eighty-five thousand, six hundred forty-one".