1261646 has 4 divisors (see below), whose sum is σ = 1892472. Its totient is φ = 630822.

The previous prime is 1261643. The next prime is 1261649. The reversal of 1261646 is 6461621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6461621 = 59 ⋅109519.

It is an interprime number because it is at equal distance from previous prime (1261643) and next prime (1261649).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315410 + ... + 315413.

It is an arithmetic number, because the mean of its divisors is an integer number (473118).

2^1261646 is an apocalyptic number.

1261646 is a deficient number, since it is larger than the sum of its proper divisors (630826).

1261646 is an equidigital number, since it uses as much as digits as its factorization.

1261646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630825.

The product of its digits is 1728, while the sum is 26.

The square root of 1261646 is about 1123.2301634126. The cubic root of 1261646 is about 108.0552415153.

The spelling of 1261646 in words is "one million, two hundred sixty-one thousand, six hundred forty-six".