5403981 has 12 divisors (see below), whose sum is σ = 7920416. Its totient is φ = 3274920.

The previous prime is 5403973. The next prime is 5403989. The reversal of 5403981 is 1893045.

It is an interprime number because it is at equal distance from previous prime (5403973) and next prime (5403989).

It is not a de Polignac number, because 5403981 - 2³ = 5403973 is a prime.

It is a super-2 number, since 2×5403981² = 58406021296722, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5403989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7081 + ... + 7806.

Almost surely, 2^5403981 is an apocalyptic number.

It is an amenable number.

5403981 is a deficient number, since it is larger than the sum of its proper divisors (2516435).

5403981 is a wasteful number, since it uses less digits than its factorization.

5403981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14912 (or 14901 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 5403981 is about 2324.6464247279. The cubic root of 5403981 is about 175.4841667196.

The spelling of 5403981 in words is "five million, four hundred three thousand, nine hundred eighty-one".