1542645 has 40 divisors (see below), whose sum is σ = 2988216. Its totient is φ = 756864.

The previous prime is 1542599. The next prime is 1542661. The reversal of 1542645 is 5462451.

1542645 is a `hidden beast` number, since 15 + 4 + 2 + 645 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 236196 + 1306449 = 486^2 + 1143^2 .

It is not a de Polignac number, because 1542645 - 2⁶ = 1542581 is a prime.

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

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 39 ways as a sum of consecutive naturals, for example, 5119 + ... + 5411.

2^1542645 is an apocalyptic number.

1542645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1542645 is a deficient number, since it is larger than the sum of its proper divisors (1445571).

1542645 is a wasteful number, since it uses less digits than its factorization.

1542645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323 (or 314 counting only the distinct ones).

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

The square root of 1542645 is about 1242.0326082676. The cubic root of 1542645 is about 115.5461107843.

It can be divided in two parts, 1542 and 645, that added together give a 7-th power (2187 = 3⁷).

The spelling of 1542645 in words is "one million, five hundred forty-two thousand, six hundred forty-five".