1640004019 has 8 divisors (see below), whose sum is σ = 1727093840. Its totient is φ = 1552991616.

The previous prime is 1640004017. The next prime is 1640004043. The reversal of 1640004019 is 9104000461.

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

It is a cyclic number.

It is not a de Polignac number, because 1640004019 - 2¹ = 1640004017 is a prime.

It is a super-2 number, since 2×1640004019² = 5379226364672304722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1640003984 and 1640004002.

It is not an unprimeable number, because it can be changed into a prime (1640004013) 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, 27007 + ... + 63319.

It is an arithmetic number, because the mean of its divisors is an integer number (215886730).

Almost surely, 2^1640004019 is an apocalyptic number.

1640004019 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1640004019 is a deficient number, since it is larger than the sum of its proper divisors (87089821).

1640004019 is a wasteful number, since it uses less digits than its factorization.

1640004019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38709.

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

The square root of 1640004019 is about 40496.9630836684. The cubic root of 1640004019 is about 1179.2746713065.

The spelling of 1640004019 in words is "one billion, six hundred forty million, four thousand, nineteen".