1021405694 has 32 divisors (see below), whose sum is σ = 1644451200. Its totient is φ = 474888960.

The previous prime is 1021405691. The next prime is 1021405727. The reversal of 1021405694 is 4965041201.

It is a self number, because there is not a number n which added to its sum of digits gives 1021405694.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021405691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185144 + ... + 190580.

It is an arithmetic number, because the mean of its divisors is an integer number (51389100).

Almost surely, 2^1021405694 is an apocalyptic number.

1021405694 is a deficient number, since it is larger than the sum of its proper divisors (623045506).

1021405694 is a wasteful number, since it uses less digits than its factorization.

1021405694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5588.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1021405694 is about 31959.4382616466. The cubic root of 1021405694 is about 1007.0849167431.

Adding to 1021405694 its reverse (4965041201), we get a palindrome (5986446895).

The spelling of 1021405694 in words is "one billion, twenty-one million, four hundred five thousand, six hundred ninety-four".