1051921240 has 64 divisors (see below), whose sum is σ = 2540496960. Its totient is φ = 390574080.

The previous prime is 1051921201. The next prime is 1051921243. The reversal of 1051921240 is 421291501.

It is a happy number.

It is a super-2 number, since 2×1051921240² = 2213076590326275200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1051921243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39045 + ... + 60235.

It is an arithmetic number, because the mean of its divisors is an integer number (39695265).

Almost surely, 2^1051921240 is an apocalyptic number.

1051921240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1051921240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1270248480).

1051921240 is an abundant number, since it is smaller than the sum of its proper divisors (1488575720).

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

1051921240 is a wasteful number, since it uses less digits than its factorization.

1051921240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21292 (or 21288 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1051921240 is about 32433.3353203151. The cubic root of 1051921240 is about 1017.0158969846.

The spelling of 1051921240 in words is "one billion, fifty-one million, nine hundred twenty-one thousand, two hundred forty".