2238781 has 8 divisors (see below), whose sum is σ = 2401920. Its totient is φ = 2079168.

The previous prime is 2238779. The next prime is 2238787. The reversal of 2238781 is 1878322.

2238781 = 184² + 185² + ... + 234².

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

It is not a de Polignac number, because 2238781 - 2¹ = 2238779 is a prime.

It is a super-2 number, since 2×2238781² = 10024280731922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2238787) 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, 510 + ... + 2176.

It is an arithmetic number, because the mean of its divisors is an integer number (300240).

2^2238781 is an apocalyptic number.

It is an amenable number.

2238781 is a deficient number, since it is larger than the sum of its proper divisors (163139).

2238781 is a wasteful number, since it uses less digits than its factorization.

2238781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1763.

The product of its digits is 5376, while the sum is 31.

The square root of 2238781 is about 1496.2556599726. The cubic root of 2238781 is about 130.8189133994.

The spelling of 2238781 in words is "two million, two hundred thirty-eight thousand, seven hundred eighty-one".