1491166446 has 64 divisors (see below), whose sum is σ = 3723632640. Its totient is φ = 386753760.

The previous prime is 1491166409. The next prime is 1491166451. The reversal of 1491166446 is 6446611941.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 1491166398 and 1491166407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 385695 + ... + 389541.

It is an arithmetic number, because the mean of its divisors is an integer number (58181760).

Almost surely, 2^1491166446 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1491166446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1861816320).

1491166446 is an abundant number, since it is smaller than the sum of its proper divisors (2232466194).

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

1491166446 is a wasteful number, since it uses less digits than its factorization.

1491166446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4709.

The product of its digits is 124416, while the sum is 42.

The square root of 1491166446 is about 38615.6243766691. The cubic root of 1491166446 is about 1142.4627292098.

The spelling of 1491166446 in words is "one billion, four hundred ninety-one million, one hundred sixty-six thousand, four hundred forty-six".