1561672 has 32 divisors (see below), whose sum is σ = 3398400. Its totient is φ = 658944.

The previous prime is 1561657. The next prime is 1561673. The reversal of 1561672 is 2761651.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 1561672.

It is not an unprimeable number, because it can be changed into a prime (1561673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4248 + ... + 4600.

It is an arithmetic number, because the mean of its divisors is an integer number (106200).

2^1561672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1699200).

1561672 is an abundant number, since it is smaller than the sum of its proper divisors (1836728).

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

1561672 is a wasteful number, since it uses less digits than its factorization.

1561672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445 (or 441 counting only the distinct ones).

The product of its digits is 2520, while the sum is 28.

The square root of 1561672 is about 1249.6687561110. The cubic root of 1561672 is about 116.0192199623.

The spelling of 1561672 in words is "one million, five hundred sixty-one thousand, six hundred seventy-two".