1021945428 has 72 divisors (see below), whose sum is σ = 2956349760. Its totient is φ = 291582720.

The previous prime is 1021945409. The next prime is 1021945447. The reversal of 1021945428 is 8245491201.

1021945428 is a `hidden beast` number, since 1 + 0 + 21 + 94 + 542 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (1021945409) and next prime (1021945447).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1021945392 and 1021945401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 214108 + ... + 218828.

Almost surely, 2^1021945428 is an apocalyptic number.

1021945428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1021945428 is an abundant number, since it is smaller than the sum of its proper divisors (1934404332).

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

1021945428 is a wasteful number, since it uses less digits than its factorization.

1021945428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5597 (or 5592 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 1021945428 is about 31967.8811934729. The cubic root of 1021945428 is about 1007.2622743654.

The spelling of 1021945428 in words is "one billion, twenty-one million, nine hundred forty-five thousand, four hundred twenty-eight".