1721240790 has 32 divisors (see below), whose sum is σ = 4132084320. Its totient is φ = 458874624.

The previous prime is 1721240789. The next prime is 1721240797. The reversal of 1721240790 is 970421271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721240797) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187426 + ... + 196394.

It is an arithmetic number, because the mean of its divisors is an integer number (129127635).

Almost surely, 2^1721240790 is an apocalyptic number.

1721240790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1721240790 is an abundant number, since it is smaller than the sum of its proper divisors (2410843530).

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

1721240790 is a wasteful number, since it uses less digits than its factorization.

1721240790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15376.

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 1721240790 is about 41487.8390615853. The cubic root of 1721240790 is about 1198.4333235498.

The spelling of 1721240790 in words is "one billion, seven hundred twenty-one million, two hundred forty thousand, seven hundred ninety".