1021862197440 has 672 divisors, whose sum is σ = 4122480960000. Its totient is φ = 232223459328.

The previous prime is 1021862197429. The next prime is 1021862197453. The reversal of 1021862197440 is 447912681201.

1021862197440 is a `hidden beast` number, since 1 + 0 + 2 + 18 + 6 + 2 + 197 + 440 = 666.

It is a tau number, because it is divible by the number of its divisors (672).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 176820471 + ... + 176826249.

Almost surely, 2^{1021862197440} is an apocalyptic number.

1021862197440 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 1021862197440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2061240480000).

1021862197440 is an abundant number, since it is smaller than the sum of its proper divisors (3100618762560).

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

1021862197440 is a wasteful number, since it uses less digits than its factorization.

1021862197440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6002 (or 5975 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 1021862197440 in words is "one trillion, twenty-one billion, eight hundred sixty-two million, one hundred ninety-seven thousand, four hundred forty".