1225256240 has 40 divisors (see below), whose sum is σ = 3067855728. Its totient is φ = 452401920.

The previous prime is 1225256237. The next prime is 1225256243. The reversal of 1225256240 is 426525221.

It is an interprime number because it is at equal distance from previous prime (1225256237) and next prime (1225256243).

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (1225256243) 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, 588026 + ... + 590105.

Almost surely, 2^1225256240 is an apocalyptic number.

1225256240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225256240 is an abundant number, since it is smaller than the sum of its proper divisors (1842599488).

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

1225256240 is a wasteful number, since it uses less digits than its factorization.

1225256240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178157 (or 1178151 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 1225256240 is about 35003.6603800231. The cubic root of 1225256240 is about 1070.0620804229.

The spelling of 1225256240 in words is "one billion, two hundred twenty-five million, two hundred fifty-six thousand, two hundred forty".