1305122790 has 32 divisors (see below), whose sum is σ = 3198942720. Its totient is φ = 340627424.

The previous prime is 1305122771. The next prime is 1305122803. The reversal of 1305122790 is 972215031.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 461400 + ... + 464219.

It is an arithmetic number, because the mean of its divisors is an integer number (99966960).

Almost surely, 2^1305122790 is an apocalyptic number.

1305122790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1305122790 is an abundant number, since it is smaller than the sum of its proper divisors (1893819930).

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

1305122790 is a wasteful number, since it uses less digits than its factorization.

1305122790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925676.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 1305122790 is about 36126.4832221460. The cubic root of 1305122790 is about 1092.8245878392.

The spelling of 1305122790 in words is "one billion, three hundred five million, one hundred twenty-two thousand, seven hundred ninety".