1861518442 has 16 divisors (see below), whose sum is σ = 3294116352. Its totient is φ = 772058160.

The previous prime is 1861518431. The next prime is 1861518457. The reversal of 1861518442 is 2448151681.

It is a super-2 number, since 2×1861518442² = 6930501819812214728, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1861518395 and 1861518404.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2144173 + ... + 2145040.

It is an arithmetic number, because the mean of its divisors is an integer number (205882272).

Almost surely, 2^1861518442 is an apocalyptic number.

1861518442 is a deficient number, since it is larger than the sum of its proper divisors (1432597910).

1861518442 is a wasteful number, since it uses less digits than its factorization.

1861518442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4289253.

The product of its digits is 61440, while the sum is 40.

The square root of 1861518442 is about 43145.3177297375. The cubic root of 1861518442 is about 1230.1435137808.

The spelling of 1861518442 in words is "one billion, eight hundred sixty-one million, five hundred eighteen thousand, four hundred forty-two".