1244542845 has 128 divisors (see below), whose sum is σ = 2637250560. Its totient is φ = 486466560.

The previous prime is 1244542843. The next prime is 1244542847. The reversal of 1244542845 is 5482454421.

It is an interprime number because it is at equal distance from previous prime (1244542843) and next prime (1244542847).

It is not a de Polignac number, because 1244542845 - 2¹ = 1244542843 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244542843) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1218435 + ... + 1219455.

It is an arithmetic number, because the mean of its divisors is an integer number (20603520).

Almost surely, 2^1244542845 is an apocalyptic number.

1244542845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1244542845 is an abundant number, since it is smaller than the sum of its proper divisors (1392707715).

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

1244542845 is a wasteful number, since it uses less digits than its factorization.

1244542845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115.

The product of its digits is 204800, while the sum is 39.

The square root of 1244542845 is about 35278.0788167383. The cubic root of 1244542845 is about 1075.6474470088.

The spelling of 1244542845 in words is "one billion, two hundred forty-four million, five hundred forty-two thousand, eight hundred forty-five".