1226845720 has 16 divisors (see below), whose sum is σ = 2760402960. Its totient is φ = 490738272.

The previous prime is 1226845657. The next prime is 1226845721. The reversal of 1226845720 is 275486221.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1226845720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1226845721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15335532 + ... + 15335611.

It is an arithmetic number, because the mean of its divisors is an integer number (172525185).

Almost surely, 2^1226845720 is an apocalyptic number.

1226845720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1226845720 is an abundant number, since it is smaller than the sum of its proper divisors (1533557240).

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

1226845720 is a wasteful number, since it uses less digits than its factorization.

1226845720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30671154 (or 30671150 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 1226845720 is about 35026.3575040283. The cubic root of 1226845720 is about 1070.5245979137.

The spelling of 1226845720 in words is "one billion, two hundred twenty-six million, eight hundred forty-five thousand, seven hundred twenty".