1245981 has 16 divisors (see below), whose sum is σ = 1919808. Its totient is φ = 710400.

The previous prime is 1245973. The next prime is 1246013. The reversal of 1245981 is 1895421.

It is a happy number.

It is not a de Polignac number, because 1245981 - 2³ = 1245973 is a prime.

It is a super-2 number, since 2×1245981² = 3104937304722, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

1245981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 550 + ... + 1671.

It is an arithmetic number, because the mean of its divisors is an integer number (119988).

2^1245981 is an apocalyptic number.

1245981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1245981 is a deficient number, since it is larger than the sum of its proper divisors (673827).

1245981 is a wasteful number, since it uses less digits than its factorization.

1245981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2252.

The product of its digits is 2880, while the sum is 30.

The square root of 1245981 is about 1116.2351902713. The cubic root of 1245981 is about 107.6061615760.

It can be divided in two parts, 124 and 5981, that added together give a triangular number (6105 = T₁₁₀).

The spelling of 1245981 in words is "one million, two hundred forty-five thousand, nine hundred eighty-one".