1639947 has 8 divisors (see below), whose sum is σ = 2301760. Its totient is φ = 1035720.

The previous prime is 1639927. The next prime is 1639949. The reversal of 1639947 is 7499361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1639947 - 2¹⁶ = 1574411 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (1639949) 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, 14329 + ... + 14442.

It is an arithmetic number, because the mean of its divisors is an integer number (287720).

2^1639947 is an apocalyptic number.

1639947 is a deficient number, since it is larger than the sum of its proper divisors (661813).

1639947 is a wasteful number, since it uses less digits than its factorization.

1639947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28793.

The product of its digits is 40824, while the sum is 39.

The square root of 1639947 is about 1280.6041542959. The cubic root of 1639947 is about 117.9261004299.

The spelling of 1639947 in words is "one million, six hundred thirty-nine thousand, nine hundred forty-seven".