1490440721 has 16 divisors (see below), whose sum is σ = 1870062720. Its totient is φ = 1153975680.

The previous prime is 1490440709. The next prime is 1490440727. The reversal of 1490440721 is 1270440941.

It is not a de Polignac number, because 1490440721 - 2¹⁰ = 1490439697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1490440727) 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, 49556 + ... + 73733.

It is an arithmetic number, because the mean of its divisors is an integer number (116878920).

Almost surely, 2^1490440721 is an apocalyptic number.

1490440721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1490440721 is a deficient number, since it is larger than the sum of its proper divisors (379621999).

1490440721 is a wasteful number, since it uses less digits than its factorization.

1490440721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123464.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 1490440721 is about 38606.2264537730. The cubic root of 1490440721 is about 1142.2773601636.

The spelling of 1490440721 in words is "one billion, four hundred ninety million, four hundred forty thousand, seven hundred twenty-one".