1980157409 has 8 divisors (see below), whose sum is σ = 2089971840. Its totient is φ = 1870902576.

The previous prime is 1980157397. The next prime is 1980157451. The reversal of 1980157409 is 9047510891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1980157409 - 2⁴ = 1980157393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1980157409.

It is not an unprimeable number, because it can be changed into a prime (1980157489) 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, 132617 + ... + 146790.

It is an arithmetic number, because the mean of its divisors is an integer number (261246480).

Almost surely, 2^1980157409 is an apocalyptic number.

1980157409 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1980157409 is a deficient number, since it is larger than the sum of its proper divisors (109814431).

1980157409 is a wasteful number, since it uses less digits than its factorization.

1980157409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279799.

The product of its (nonzero) digits is 90720, while the sum is 44.

The square root of 1980157409 is about 44498.9596395242. The cubic root of 1980157409 is about 1255.7405107925.

The spelling of 1980157409 in words is "one billion, nine hundred eighty million, one hundred fifty-seven thousand, four hundred nine".