1021938145 has 8 divisors (see below), whose sum is σ = 1243598400. Its totient is φ = 806035440.

The previous prime is 1021938143. The next prime is 1021938149. The reversal of 1021938145 is 5418391201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1021938145 - 2¹ = 1021938143 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021938145.

It is not an unprimeable number, because it can be changed into a prime (1021938143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1438995 + ... + 1439704.

It is an arithmetic number, because the mean of its divisors is an integer number (155449800).

Almost surely, 2^1021938145 is an apocalyptic number.

It is an amenable number.

1021938145 is a deficient number, since it is larger than the sum of its proper divisors (221660255).

1021938145 is an equidigital number, since it uses as much as digits as its factorization.

1021938145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2878775.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 1021938145 is about 31967.7672820608. The cubic root of 1021938145 is about 1007.2598815734.

The spelling of 1021938145 in words is "one billion, twenty-one million, nine hundred thirty-eight thousand, one hundred forty-five".