1640139 has 8 divisors (see below), whose sum is σ = 2208912. Its totient is φ = 1082400.

The previous prime is 1640131. The next prime is 1640147. The reversal of 1640139 is 9310461.

It is an interprime number because it is at equal distance from previous prime (1640131) and next prime (1640147).

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

It is not a de Polignac number, because 1640139 - 2³ = 1640131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640131) 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, 2404 + ... + 3009.

It is an arithmetic number, because the mean of its divisors is an integer number (276114).

2^1640139 is an apocalyptic number.

1640139 is a deficient number, since it is larger than the sum of its proper divisors (568773).

1640139 is a wasteful number, since it uses less digits than its factorization.

1640139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5517.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 1640139 is about 1280.6791167189. The cubic root of 1640139 is about 117.9307023932.

The spelling of 1640139 in words is "one million, six hundred forty thousand, one hundred thirty-nine".