1618217240 has 16 divisors (see below), whose sum is σ = 3640988880. Its totient is φ = 647286880.

The previous prime is 1618217203. The next prime is 1618217243. The reversal of 1618217240 is 427128161.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1618217197 and 1618217206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618217243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20227676 + ... + 20227755.

It is an arithmetic number, because the mean of its divisors is an integer number (227561805).

Almost surely, 2^1618217240 is an apocalyptic number.

1618217240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1618217240 is an abundant number, since it is smaller than the sum of its proper divisors (2022771640).

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

1618217240 is a wasteful number, since it uses less digits than its factorization.

1618217240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40455442 (or 40455438 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 1618217240 is about 40227.0709845994. The cubic root of 1618217240 is about 1174.0293151186.

The spelling of 1618217240 in words is "one billion, six hundred eighteen million, two hundred seventeen thousand, two hundred forty".