2403681 has 16 divisors (see below), whose sum is σ = 3878784. Its totient is φ = 1292544.

The previous prime is 2403679. The next prime is 2403689. The reversal of 2403681 is 1863042.

It is a happy number.

It is not a de Polignac number, because 2403681 - 2¹ = 2403679 is a prime.

It is a super-2 number, since 2×2403681² = 11555364699522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2403689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3010 + ... + 3723.

It is an arithmetic number, because the mean of its divisors is an integer number (242424).

2^2403681 is an apocalyptic number.

2403681 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2403681 is a deficient number, since it is larger than the sum of its proper divisors (1475103).

2403681 is a wasteful number, since it uses less digits than its factorization.

2403681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6760.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 2403681 is about 1550.3809209352. The cubic root of 2403681 is about 133.9550045706.

The spelling of 2403681 in words is "two million, four hundred three thousand, six hundred eighty-one".