1946400003581 has 4 divisors (see below), whose sum is σ = 2123345458464. Its totient is φ = 1769454548700.

The previous prime is 1946400003517. The next prime is 1946400003589. The reversal of 1946400003581 is 1853000046491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1946400003581 - 2⁶ = 1946400003517 is a prime.

It is a super-2 number, since 2×1946400003581² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1946400003589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88472727425 + ... + 88472727446.

It is an arithmetic number, because the mean of its divisors is an integer number (530836364616).

Almost surely, 2^{1946400003581} is an apocalyptic number.

1946400003581 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1946400003581 is a deficient number, since it is larger than the sum of its proper divisors (176945454883).

1946400003581 is a wasteful number, since it uses less digits than its factorization.

1946400003581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176945454882.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 1946400003581 in words is "one trillion, nine hundred forty-six billion, four hundred million, three thousand, five hundred eighty-one".