1977745 has 24 divisors (see below), whose sum is σ = 2987712. Its totient is φ = 1230240.

The previous prime is 1977743. The next prime is 1977749. The reversal of 1977745 is 5477791.

It is not a de Polignac number, because 1977745 - 2¹ = 1977743 is a prime.

It is a super-2 number, since 2×1977745² = 7822950570050, which contains 22 as substring.

Its product of digits (61740) is a multiple of the sum of its prime divisors (490).

1977745 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1977698 and 1977707.

It is not an unprimeable number, because it can be changed into a prime (1977743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4002 + ... + 4468.

It is an arithmetic number, because the mean of its divisors is an integer number (124488).

2^1977745 is an apocalyptic number.

It is an amenable number.

1977745 is a deficient number, since it is larger than the sum of its proper divisors (1009967).

1977745 is a wasteful number, since it uses less digits than its factorization.

1977745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501 (or 490 counting only the distinct ones).

The product of its digits is 61740, while the sum is 40.

The square root of 1977745 is about 1406.3232203160. The cubic root of 1977745 is about 125.5230350886.

The spelling of 1977745 in words is "one million, nine hundred seventy-seven thousand, seven hundred forty-five".