1955940381 has 24 divisors (see below), whose sum is σ = 2953333760. Its totient is φ = 1245909600.

The previous prime is 1955940379. The next prime is 1955940421. The reversal of 1955940381 is 1830495591.

1955940381 is a `hidden beast` number, since 19 + 559 + 4 + 0 + 3 + 81 = 666.

It is not a de Polignac number, because 1955940381 - 2¹ = 1955940379 is a prime.

It is a super-2 number, since 2×1955940381² = 7651405548052850322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1955940281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22330 + ... + 66411.

Almost surely, 2^1955940381 is an apocalyptic number.

It is an amenable number.

1955940381 is a deficient number, since it is larger than the sum of its proper divisors (997393379).

1955940381 is a wasteful number, since it uses less digits than its factorization.

1955940381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88857 (or 88854 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The square root of 1955940381 is about 44226.0147537623. The cubic root of 1955940381 is about 1250.6003262539.

The spelling of 1955940381 in words is "one billion, nine hundred fifty-five million, nine hundred forty thousand, three hundred eighty-one".