1642437247 has 4 divisors (see below), whose sum is σ = 1791749736. Its totient is φ = 1493124760.

The previous prime is 1642437227. The next prime is 1642437253. The reversal of 1642437247 is 7427342461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1642437247 - 2¹⁹ = 1641912959 is a prime.

It is a super-2 number, since 2×1642437247² = 5395200220665878018, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642437217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74656228 + ... + 74656249.

It is an arithmetic number, because the mean of its divisors is an integer number (447937434).

Almost surely, 2^1642437247 is an apocalyptic number.

1642437247 is a deficient number, since it is larger than the sum of its proper divisors (149312489).

1642437247 is a wasteful number, since it uses less digits than its factorization.

1642437247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149312488.

The product of its digits is 225792, while the sum is 40.

The square root of 1642437247 is about 40526.9940533467. The cubic root of 1642437247 is about 1179.8576020353.

The spelling of 1642437247 in words is "one billion, six hundred forty-two million, four hundred thirty-seven thousand, two hundred forty-seven".