1956645 has 12 divisors (see below), whose sum is σ = 3391596. Its totient is φ = 1043520.

The previous prime is 1956637. The next prime is 1956653. The reversal of 1956645 is 5466591.

1956645 is a `hidden beast` number, since 1 + 9 + 5 + 6 + 645 = 666.

It is an interprime number because it is at equal distance from previous prime (1956637) and next prime (1956653).

It can be written as a sum of positive squares in 2 ways, for example, as 1046529 + 910116 = 1023^2 + 954^2 .

It is not a de Polignac number, because 1956645 - 2³ = 1956637 is a prime.

1956645 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21696 + ... + 21785.

It is an arithmetic number, because the mean of its divisors is an integer number (282633).

2^1956645 is an apocalyptic number.

1956645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1956645 is a deficient number, since it is larger than the sum of its proper divisors (1434951).

1956645 is a wasteful number, since it uses less digits than its factorization.

1956645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43492 (or 43489 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 1956645 is about 1398.8012725187. The cubic root of 1956645 is about 125.0750482664.

It can be divided in two parts, 1956 and 645, that added together give a square (2601 = 51²).

The spelling of 1956645 in words is "one million, nine hundred fifty-six thousand, six hundred forty-five".