1051023440 has 40 divisors (see below), whose sum is σ = 2457786888. Its totient is φ = 417973760.

The previous prime is 1051023431. The next prime is 1051023451. The reversal of 1051023440 is 443201501.

It can be written as a sum of positive squares in 4 ways, for example, as 511483456 + 539539984 = 22616^2 + 23228^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1051023440² = 2209300542858867200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24131 + ... + 51810.

Almost surely, 2^1051023440 is an apocalyptic number.

1051023440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1051023440 is an abundant number, since it is smaller than the sum of its proper divisors (1406763448).

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

1051023440 is a wasteful number, since it uses less digits than its factorization.

1051023440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76127 (or 76121 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1051023440 is about 32419.4916678223. The cubic root of 1051023440 is about 1016.7264783707.

Adding to 1051023440 its reverse (443201501), we get a palindrome (1494224941).

The spelling of 1051023440 in words is "one billion, fifty-one million, twenty-three thousand, four hundred forty".