1780045381 has 8 divisors (see below), whose sum is σ = 1919433600. Its totient is φ = 1645227360.

The previous prime is 1780045363. The next prime is 1780045387. The reversal of 1780045381 is 1835400871.

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 1780045381 - 2⁵ = 1780045349 is a prime.

It is a super-2 number, since 2×1780045381² = 6337123116838870322, which contains 22 as substring.

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 1780045381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1780045387) 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, 1141741 + ... + 1143298.

It is an arithmetic number, because the mean of its divisors is an integer number (239929200).

Almost surely, 2^1780045381 is an apocalyptic number.

It is an amenable number.

1780045381 is a deficient number, since it is larger than the sum of its proper divisors (139388219).

1780045381 is a wasteful number, since it uses less digits than its factorization.

1780045381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285099.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 1780045381 is about 42190.5840324592. The cubic root of 1780045381 is about 1211.9285732813.

The spelling of 1780045381 in words is "one billion, seven hundred eighty million, forty-five thousand, three hundred eighty-one".