1782172485 has 24 divisors (see below), whose sum is σ = 3188749824. Its totient is φ = 919830240.

The previous prime is 1782172477. The next prime is 1782172487. The reversal of 1782172485 is 5842712871.

It is not a de Polignac number, because 1782172485 - 2³ = 1782172477 is a prime.

It is a super-2 number, since 2×1782172485² = 6352277532582150450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1782172485.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1782172487) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 637377 + ... + 640166.

It is an arithmetic number, because the mean of its divisors is an integer number (132864576).

Almost surely, 2^1782172485 is an apocalyptic number.

1782172485 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1782172485 is a deficient number, since it is larger than the sum of its proper divisors (1406577339).

1782172485 is a wasteful number, since it uses less digits than its factorization.

1782172485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277585 (or 1277582 counting only the distinct ones).

The product of its digits is 250880, while the sum is 45.

The square root of 1782172485 is about 42215.7847848408. The cubic root of 1782172485 is about 1212.4111212706.

The spelling of 1782172485 in words is "one billion, seven hundred eighty-two million, one hundred seventy-two thousand, four hundred eighty-five".