1868397121 has 8 divisors (see below), whose sum is σ = 2010735144. Its totient is φ = 1729662720.

The previous prime is 1868397119. The next prime is 1868397127. The reversal of 1868397121 is 1217938681.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 398441521 + 1469955600 = 19961^2 + 38340^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1868397121 - 2¹ = 1868397119 is a prime.

It is a super-2 number, since 2×1868397121² = 6981815603522177282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1868397127) 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, 899830 + ... + 901903.

It is an arithmetic number, because the mean of its divisors is an integer number (251341893).

Almost surely, 2^1868397121 is an apocalyptic number.

It is an amenable number.

1868397121 is a deficient number, since it is larger than the sum of its proper divisors (142338023).

1868397121 is a wasteful number, since it uses less digits than its factorization.

1868397121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1801811.

The product of its digits is 145152, while the sum is 46.

The square root of 1868397121 is about 43224.9594678815. The cubic root of 1868397121 is about 1231.6568591731.

The spelling of 1868397121 in words is "one billion, eight hundred sixty-eight million, three hundred ninety-seven thousand, one hundred twenty-one".