1241220440 has 16 divisors (see below), whose sum is σ = 2792746080. Its totient is φ = 496488160.

The previous prime is 1241220427. The next prime is 1241220451. The reversal of 1241220440 is 440221421.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15515216 + ... + 15515295.

It is an arithmetic number, because the mean of its divisors is an integer number (174546630).

Almost surely, 2^1241220440 is an apocalyptic number.

1241220440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1241220440 is an abundant number, since it is smaller than the sum of its proper divisors (1551525640).

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

1241220440 is a wasteful number, since it uses less digits than its factorization.

1241220440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31030522 (or 31030518 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 1241220440 is about 35230.9585450070. The cubic root of 1241220440 is about 1074.6894188410.

Adding to 1241220440 its reverse (440221421), we get a palindrome (1681441861).

The spelling of 1241220440 in words is "one billion, two hundred forty-one million, two hundred twenty thousand, four hundred forty".