4156381 has 4 divisors (see below), whose sum is σ = 4400892. Its totient is φ = 3911872.

The previous prime is 4156379. The next prime is 4156409. The reversal of 4156381 is 1836514.

4156381 = 333² + 334² + ... + 366².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1836514 = 2 ⋅918257.

It can be written as a sum of positive squares in 2 ways, for example, as 3740356 + 416025 = 1934^2 + 645^2 .

It is a cyclic number.

It is not a de Polignac number, because 4156381 - 2¹ = 4156379 is a prime.

It is a super-2 number, since 2×4156381² = 34551006034322, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4156301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122230 + ... + 122263.

It is an arithmetic number, because the mean of its divisors is an integer number (1100223).

Almost surely, 2^4156381 is an apocalyptic number.

It is an amenable number.

4156381 is a deficient number, since it is larger than the sum of its proper divisors (244511).

4156381 is a wasteful number, since it uses less digits than its factorization.

4156381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244510.

The product of its digits is 2880, while the sum is 28.

The square root of 4156381 is about 2038.7204320357. The cubic root of 4156381 is about 160.7823789714.

The spelling of 4156381 in words is "four million, one hundred fifty-six thousand, three hundred eighty-one".