1640149 has 8 divisors (see below), whose sum is σ = 1918400. Its totient is φ = 1372896.

The previous prime is 1640147. The next prime is 1640167. The reversal of 1640149 is 9410461.

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

It is not a de Polignac number, because 1640149 - 2¹ = 1640147 is a prime.

It is a Duffinian number.

1640149 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640147) 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, 2424 + ... + 3025.

It is an arithmetic number, because the mean of its divisors is an integer number (239800).

2^1640149 is an apocalyptic number.

It is an amenable number.

1640149 is a deficient number, since it is larger than the sum of its proper divisors (278251).

1640149 is an equidigital number, since it uses as much as digits as its factorization.

1640149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5499.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1640149 is about 1280.6830208916. The cubic root of 1640149 is about 117.9309420689.

The spelling of 1640149 in words is "one million, six hundred forty thousand, one hundred forty-nine".