1261628 has 6 divisors (see below), whose sum is σ = 2207856. Its totient is φ = 630812.

The previous prime is 1261627. The next prime is 1261639. The reversal of 1261628 is 8261621.

It is a junction number, because it is equal to n+sod(n) for n = 1261597 and 1261606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157700 + ... + 157707.

It is an arithmetic number, because the mean of its divisors is an integer number (367976).

2^1261628 is an apocalyptic number.

It is an amenable number.

1261628 is a deficient number, since it is larger than the sum of its proper divisors (946228).

1261628 is a wasteful number, since it uses less digits than its factorization.

1261628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315411 (or 315409 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

The square root of 1261628 is about 1123.2221507787. Note that the first 3 decimals coincide. The cubic root of 1261628 is about 108.0547276354.

The spelling of 1261628 in words is "one million, two hundred sixty-one thousand, six hundred twenty-eight".