1220431400 has 24 divisors (see below), whose sum is σ = 2837503470. Its totient is φ = 488172480.

The previous prime is 1220431397. The next prime is 1220431403. The reversal of 1220431400 is 41340221.

It is an interprime number because it is at equal distance from previous prime (1220431397) and next prime (1220431403).

It can be written as a sum of positive squares in 3 ways, for example, as 618317956 + 602113444 = 24866^2 + 24538^2 .

It is not an unprimeable number, because it can be changed into a prime (1220431403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3050879 + ... + 3051278.

Almost surely, 2^1220431400 is an apocalyptic number.

1220431400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220431400 is an abundant number, since it is smaller than the sum of its proper divisors (1617072070).

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

1220431400 is a wasteful number, since it uses less digits than its factorization.

1220431400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6102173 (or 6102164 counting only the distinct ones).

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

The square root of 1220431400 is about 34934.6733203561. The cubic root of 1220431400 is about 1068.6556616797.

Adding to 1220431400 its reverse (41340221), we get a palindrome (1261771621).

The spelling of 1220431400 in words is "one billion, two hundred twenty million, four hundred thirty-one thousand, four hundred".