1440212381 has 2 divisors, whose sum is σ = 1440212382. Its totient is φ = 1440212380.

The previous prime is 1440212269. The next prime is 1440212437. The reversal of 1440212381 is 1832120441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1018567225 + 421645156 = 31915^2 + 20534^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1440212381 is a prime.

It is a super-2 number, since 2×1440212381² = 4148423404771378322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1440212381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1440212881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 720106190 + 720106191.

It is an arithmetic number, because the mean of its divisors is an integer number (720106191).

Almost surely, 2^1440212381 is an apocalyptic number.

It is an amenable number.

1440212381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1440212381 is an equidigital number, since it uses as much as digits as its factorization.

1440212381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 1440212381 is about 37950.1301842299. The cubic root of 1440212381 is about 1129.2987480873.

The spelling of 1440212381 in words is "one billion, four hundred forty million, two hundred twelve thousand, three hundred eighty-one".