1578642 has 32 divisors (see below), whose sum is σ = 3498432. Its totient is φ = 471744.

The previous prime is 1578641. The next prime is 1578701. The reversal of 1578642 is 2468751.

It is a super-2 number, since 2×1578642² = 4984221128328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1578641) 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, 2613 + ... + 3159.

It is an arithmetic number, because the mean of its divisors is an integer number (109326).

2^1578642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1578642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1749216).

1578642 is an abundant number, since it is smaller than the sum of its proper divisors (1919790).

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

1578642 is a wasteful number, since it uses less digits than its factorization.

1578642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602.

The product of its digits is 13440, while the sum is 33.

The square root of 1578642 is about 1256.4402094807. The cubic root of 1578642 is about 116.4379500966.

The spelling of 1578642 in words is "one million, five hundred seventy-eight thousand, six hundred forty-two".