1240140400 has 30 divisors (see below), whose sum is σ = 2979438272. Its totient is φ = 496056000.

The previous prime is 1240140389. The next prime is 1240140409. The reversal of 1240140400 is 40410421.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240140409) 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, 1549776 + ... + 1550575.

Almost surely, 2^1240140400 is an apocalyptic number.

1240140400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1240140400 is an abundant number, since it is smaller than the sum of its proper divisors (1739297872).

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

1240140400 is a wasteful number, since it uses less digits than its factorization.

1240140400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3100369 (or 3100358 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1240140400 is about 35215.6272129292. The cubic root of 1240140400 is about 1074.3776170191.

Adding to 1240140400 its reverse (40410421), we get a palindrome (1280550821).

The spelling of 1240140400 in words is "one billion, two hundred forty million, one hundred forty thousand, four hundred".