2978431 has 4 divisors (see below), whose sum is σ = 3107952. Its totient is φ = 2848912.

The previous prime is 2978429. The next prime is 2978453. The reversal of 2978431 is 1348792.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2978431 - 2¹ = 2978429 is a prime.

It is a super-2 number, since 2×2978431² = 17742102443522, 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 (2978401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64726 + ... + 64771.

It is an arithmetic number, because the mean of its divisors is an integer number (776988).

2^2978431 is an apocalyptic number.

2978431 is the 1092-nd centered pentagonal number.

2978431 is a deficient number, since it is larger than the sum of its proper divisors (129521).

2978431 is a wasteful number, since it uses less digits than its factorization.

2978431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129520.

The product of its digits is 12096, while the sum is 34.

The square root of 2978431 is about 1725.8131416813. The cubic root of 2978431 is about 143.8784822312.

The spelling of 2978431 in words is "two million, nine hundred seventy-eight thousand, four hundred thirty-one".