1405041781 has 32 divisors (see below), whose sum is σ = 1681344000. Its totient is φ = 1157345280.

The previous prime is 1405041769. The next prime is 1405041821. The reversal of 1405041781 is 1871405041.

It is not a de Polignac number, because 1405041781 - 2⁹ = 1405041269 is a prime.

It is a super-2 number, since 2×1405041781² = 3948284812711303922, 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 (1405041761) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3129045 + ... + 3129493.

It is an arithmetic number, because the mean of its divisors is an integer number (52542000).

Almost surely, 2^1405041781 is an apocalyptic number.

1405041781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1405041781 is a deficient number, since it is larger than the sum of its proper divisors (276302219).

1405041781 is a wasteful number, since it uses less digits than its factorization.

1405041781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 1405041781 is about 37483.8869515956. The cubic root of 1405041781 is about 1120.0302343560.

The spelling of 1405041781 in words is "one billion, four hundred five million, forty-one thousand, seven hundred eighty-one".