1220400030440 has 32 divisors (see below), whose sum is σ = 2745962505000. Its totient is φ = 488148912384.

The previous prime is 1220400030439. The next prime is 1220400030449. The reversal of 1220400030440 is 440300040221.

It can be written as a sum of positive squares in 4 ways, for example, as 1013569724644 + 206830305796 = 1006762^2 + 454786^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (1220400030449) 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, 1564286 + ... + 2210834.

Almost surely, 2^{1220400030440} is an apocalyptic number.

1220400030440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220400030440 is an abundant number, since it is smaller than the sum of its proper divisors (1525562474560).

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

1220400030440 is a wasteful number, since it uses less digits than its factorization.

1220400030440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693749 (or 693745 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 1220400030440 its reverse (440300040221), we get a palindrome (1660700070661).

The spelling of 1220400030440 in words is "one trillion, two hundred twenty billion, four hundred million, thirty thousand, four hundred forty".