1020123440 has 40 divisors (see below), whose sum is σ = 2710615200. Its totient is φ = 349756416.

The previous prime is 1020123431. The next prime is 1020123457. The reversal of 1020123440 is 443210201.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 910265 + ... + 911384.

It is an arithmetic number, because the mean of its divisors is an integer number (67765380).

Almost surely, 2^1020123440 is an apocalyptic number.

1020123440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020123440 is an abundant number, since it is smaller than the sum of its proper divisors (1690491760).

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

1020123440 is a wasteful number, since it uses less digits than its factorization.

1020123440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821669 (or 1821663 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1020123440 is about 31939.3713150400. The cubic root of 1020123440 is about 1006.6633149507.

Adding to 1020123440 its reverse (443210201), we get a palindrome (1463333641).

The spelling of 1020123440 in words is "one billion, twenty million, one hundred twenty-three thousand, four hundred forty".