1213540400 has 30 divisors (see below), whose sum is σ = 2915531772. Its totient is φ = 485416000.

The previous prime is 1213540373. The next prime is 1213540429. The reversal of 1213540400 is 40453121.

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1516526 + ... + 1517325.

Almost surely, 2^1213540400 is an apocalyptic number.

1213540400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213540400 is an abundant number, since it is smaller than the sum of its proper divisors (1701991372).

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

1213540400 is a wasteful number, since it uses less digits than its factorization.

1213540400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3033869 (or 3033858 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1213540400 is about 34835.9067629938. The cubic root of 1213540400 is about 1066.6405245329.

Adding to 1213540400 its reverse (40453121), we get a palindrome (1253993521).

The spelling of 1213540400 in words is "one billion, two hundred thirteen million, five hundred forty thousand, four hundred".