1400021281 has 16 divisors (see below), whose sum is σ = 1532244816. Its totient is φ = 1273798656.

The previous prime is 1400021267. The next prime is 1400021291. The reversal of 1400021281 is 1821200041.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 482900625 + 917120656 = 21975^2 + 30284^2 .

It is a cyclic number.

It is not a de Polignac number, because 1400021281 - 2¹⁷ = 1399890209 is a prime.

It is a super-2 number, since 2×1400021281² = 3920119174505761922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1400021291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91665 + ... + 105841.

It is an arithmetic number, because the mean of its divisors is an integer number (95765301).

Almost surely, 2^1400021281 is an apocalyptic number.

It is an amenable number.

1400021281 is a deficient number, since it is larger than the sum of its proper divisors (132223535).

1400021281 is a wasteful number, since it uses less digits than its factorization.

1400021281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14388.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 1400021281 is about 37416.8582459832. The cubic root of 1400021281 is about 1118.6946103430.

The spelling of 1400021281 in words is "one billion, four hundred million, twenty-one thousand, two hundred eighty-one".