7402991 has 4 divisors (see below), whose sum is σ = 7408800. Its totient is φ = 7397184.

The previous prime is 7402981. The next prime is 7403023. The reversal of 7402991 is 1992047.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1992047 = 71 ⋅28057.

It is a cyclic number.

It is not a de Polignac number, because 7402991 - 2¹⁴ = 7386607 is a prime.

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 (7402921) 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, 71 + ... + 3848.

It is an arithmetic number, because the mean of its divisors is an integer number (1852200).

Almost surely, 2^7402991 is an apocalyptic number.

7402991 is a deficient number, since it is larger than the sum of its proper divisors (5809).

7402991 is a wasteful number, since it uses less digits than its factorization.

7402991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5808.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 7402991 is about 2720.8438029406. The cubic root of 7402991 is about 194.8957672182.

The spelling of 7402991 in words is "seven million, four hundred two thousand, nine hundred ninety-one".