1021415440 has 40 divisors (see below), whose sum is σ = 2377222848. Its totient is φ = 408147840.

The previous prime is 1021415389. The next prime is 1021415449. The reversal of 1021415440 is 445141201.

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

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1021415449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79035 + ... + 91045.

Almost surely, 2^1021415440 is an apocalyptic number.

1021415440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021415440 is an abundant number, since it is smaller than the sum of its proper divisors (1355807408).

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

1021415440 is a wasteful number, since it uses less digits than its factorization.

1021415440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13087 (or 13081 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 1021415440 is about 31959.5907358026. The cubic root of 1021415440 is about 1007.0881198512.

Adding to 1021415440 its reverse (445141201), we get a palindrome (1466556641).

The spelling of 1021415440 in words is "one billion, twenty-one million, four hundred fifteen thousand, four hundred forty".