1994426281 has 27 divisors (see below), whose sum is σ = 2208555237. Its totient is φ = 1800650880.

The previous prime is 1994426279. The next prime is 1994426303. The reversal of 1994426281 is 1826244991.

The square root of 1994426281 is 44659.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 927750681 + 1066675600 = 30459^2 + 32660^2 .

It is not a de Polignac number, because 1994426281 - 2¹ = 1994426279 is a prime.

It is a super-2 number, since 2×1994426281² = 7955472380686981922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1994426201) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 28090476 + ... + 28090546.

Almost surely, 2^1994426281 is an apocalyptic number.

1994426281 is the 44659-th square number.

1994426281 is the 22330-th centered octagonal number.

It is an amenable number.

1994426281 is a deficient number, since it is larger than the sum of its proper divisors (214128956).

1994426281 is an frugal number, since it uses more digits than its factorization.

1994426281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250 (or 125 counting only the distinct ones).

The product of its digits is 248832, while the sum is 46.

The cubic root of 1994426281 is about 1258.7495533055.

It can be divided in two parts, 19944 and 26281, that added together give a square (46225 = 215²).

The spelling of 1994426281 in words is "one billion, nine hundred ninety-four million, four hundred twenty-six thousand, two hundred eighty-one".