1661432 has 8 divisors (see below), whose sum is σ = 3115200. Its totient is φ = 830712.

The previous prime is 1661431. The next prime is 1661437. The reversal of 1661432 is 2341661.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 1661398 and 1661407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103832 + ... + 103847.

It is an arithmetic number, because the mean of its divisors is an integer number (389400).

2^1661432 is an apocalyptic number.

It is an amenable number.

1661432 is a deficient number, since it is larger than the sum of its proper divisors (1453768).

1661432 is a wasteful number, since it uses less digits than its factorization.

1661432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207685 (or 207681 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

The square root of 1661432 is about 1288.9654766517. The cubic root of 1661432 is about 118.4388522969.

The spelling of 1661432 in words is "one million, six hundred sixty-one thousand, four hundred thirty-two".