1645542 has 32 divisors (see below), whose sum is σ = 3778560. Its totient is φ = 530280.

The previous prime is 1645537. The next prime is 1645543. The reversal of 1645542 is 2455461.

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 (1645543) 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, 1183 + ... + 2165.

It is an arithmetic number, because the mean of its divisors is an integer number (118080).

2^1645542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1645542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1889280).

1645542 is an abundant number, since it is smaller than the sum of its proper divisors (2133018).

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

1645542 is a wasteful number, since it uses less digits than its factorization.

1645542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025 (or 1019 counting only the distinct ones).

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

The square root of 1645542 is about 1282.7868100351. The cubic root of 1645542 is about 118.0600575251.

It can be divided in two parts, 1645 and 542, that added together give a 7-th power (2187 = 3⁷).

The spelling of 1645542 in words is "one million, six hundred forty-five thousand, five hundred forty-two".