1400266721 has 4 divisors (see below), whose sum is σ = 1600304832. Its totient is φ = 1200228612.

The previous prime is 1400266709. The next prime is 1400266753. The reversal of 1400266721 is 1276620041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1400266721 - 2¹⁴ = 1400250337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1400266771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100019045 + ... + 100019058.

It is an arithmetic number, because the mean of its divisors is an integer number (400076208).

Almost surely, 2^1400266721 is an apocalyptic number.

It is an amenable number.

1400266721 is a deficient number, since it is larger than the sum of its proper divisors (200038111).

1400266721 is an equidigital number, since it uses as much as digits as its factorization.

1400266721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200038110.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 1400266721 is about 37420.1379072820. The cubic root of 1400266721 is about 1118.7599799116.

Adding to 1400266721 its reverse (1276620041), we get a palindrome (2676886762).

The spelling of 1400266721 in words is "one billion, four hundred million, two hundred sixty-six thousand, seven hundred twenty-one".