1430721890 has 48 divisors (see below), whose sum is σ = 2827082088. Its totient is φ = 520985088.

The previous prime is 1430721881. The next prime is 1430721913. The reversal of 1430721890 is 981270341.

It can be written as a sum of positive squares in 12 ways, for example, as 46063369 + 1384658521 = 6787^2 + 37211^2 .

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 1430721890.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 117572 + ... + 129168.

Almost surely, 2^1430721890 is an apocalyptic number.

1430721890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1430721890 is a deficient number, since it is larger than the sum of its proper divisors (1396360198).

1430721890 is a wasteful number, since it uses less digits than its factorization.

1430721890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11703 (or 11690 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 1430721890 is about 37824.8845338621. The cubic root of 1430721890 is about 1126.8127193960.

The spelling of 1430721890 in words is "one billion, four hundred thirty million, seven hundred twenty-one thousand, eight hundred ninety".