1642487869 has 8 divisors (see below), whose sum is σ = 1797222240. Its totient is φ = 1488656400.

The previous prime is 1642487857. The next prime is 1642487879. The reversal of 1642487869 is 9687842461.

It is a happy number.

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

It is not a de Polignac number, because 1642487869 - 2⁷ = 1642487741 is a prime.

It is a super-2 number, since 2×1642487869² = 5395532799624322322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642487879) 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, 221914 + ... + 229195.

It is an arithmetic number, because the mean of its divisors is an integer number (224652780).

Almost surely, 2^1642487869 is an apocalyptic number.

It is an amenable number.

1642487869 is a deficient number, since it is larger than the sum of its proper divisors (154734371).

1642487869 is a wasteful number, since it uses less digits than its factorization.

1642487869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451451.

The product of its digits is 4644864, while the sum is 55.

The square root of 1642487869 is about 40527.6185952247. The cubic root of 1642487869 is about 1179.8697234802.

The spelling of 1642487869 in words is "one billion, six hundred forty-two million, four hundred eighty-seven thousand, eight hundred sixty-nine".