1645245 has 32 divisors (see below), whose sum is σ = 3344640. Its totient is φ = 751680.

The previous prime is 1645211. The next prime is 1645249. The reversal of 1645245 is 5425461.

It is not a de Polignac number, because 1645245 - 2⁸ = 1644989 is a prime.

It is a super-2 number, since 2×1645245² = 5413662220050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645249) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75 + ... + 1815.

It is an arithmetic number, because the mean of its divisors is an integer number (104520).

2^1645245 is an apocalyptic number.

1645245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1645245 is an abundant number, since it is smaller than the sum of its proper divisors (1699395).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1645245 is a wasteful number, since it uses less digits than its factorization.

1645245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1762 (or 1756 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 1645245 is about 1282.6710412261. The cubic root of 1645245 is about 118.0529543038.

The spelling of 1645245 in words is "one million, six hundred forty-five thousand, two hundred forty-five".