1642117240 has 32 divisors (see below), whose sum is σ = 3784883760. Its totient is φ = 640825600.

The previous prime is 1642117231. The next prime is 1642117247. The reversal of 1642117240 is 427112461.

It is a junction number, because it is equal to n+sod(n) for n = 1642117199 and 1642117208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642117247) 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, 499006 + ... + 502285.

Almost surely, 2^1642117240 is an apocalyptic number.

1642117240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1642117240 is an abundant number, since it is smaller than the sum of its proper divisors (2142766520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1642117240 is a wasteful number, since it uses less digits than its factorization.

1642117240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001343 (or 1001339 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 1642117240 is about 40523.0457887854. The cubic root of 1642117240 is about 1179.7809705503.

The spelling of 1642117240 in words is "one billion, six hundred forty-two million, one hundred seventeen thousand, two hundred forty".