1214143540 has 24 divisors (see below), whose sum is σ = 2560291272. Its totient is φ = 483640320.

The previous prime is 1214143517. The next prime is 1214143547. The reversal of 1214143540 is 453414121.

It can be written as a sum of positive squares in 4 ways, for example, as 430479504 + 783664036 = 20748^2 + 27994^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1214143547) 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, 121129 + ... + 130768.

It is an arithmetic number, because the mean of its divisors is an integer number (106678803).

Almost surely, 2^1214143540 is an apocalyptic number.

1214143540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1214143540 is an abundant number, since it is smaller than the sum of its proper divisors (1346147732).

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

1214143540 is a wasteful number, since it uses less digits than its factorization.

1214143540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252147 (or 252145 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1214143540 is about 34844.5625600322. The cubic root of 1214143540 is about 1066.8172050990.

Adding to 1214143540 its reverse (453414121), we get a palindrome (1667557661).

The spelling of 1214143540 in words is "one billion, two hundred fourteen million, one hundred forty-three thousand, five hundred forty".