1051223440 has 20 divisors (see below), whose sum is σ = 2444094684. Its totient is φ = 420489344.

The previous prime is 1051223429. The next prime is 1051223447. The reversal of 1051223440 is 443221501.

It can be written as a sum of positive squares in 2 ways, for example, as 497468416 + 553755024 = 22304^2 + 23532^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×1051223440² = 2210141441610867200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1051223447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6570067 + ... + 6570226.

Almost surely, 2^1051223440 is an apocalyptic number.

1051223440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1051223440 is an abundant number, since it is smaller than the sum of its proper divisors (1392871244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1051223440 is a wasteful number, since it uses less digits than its factorization.

1051223440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13140306 (or 13140300 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 1051223440 is about 32422.5760851910. The cubic root of 1051223440 is about 1016.7909654827.

Adding to 1051223440 its reverse (443221501), we get a palindrome (1494444941).

The spelling of 1051223440 in words is "one billion, fifty-one million, two hundred twenty-three thousand, four hundred forty".