30987494 has 4 divisors (see below), whose sum is σ = 46481244. Its totient is φ = 15493746.

The previous prime is 30987493. The next prime is 30987497. The reversal of 30987494 is 49478903.

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

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30987493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7746872 + ... + 7746875.

It is an arithmetic number, because the mean of its divisors is an integer number (11620311).

Almost surely, 2^30987494 is an apocalyptic number.

30987494 is a deficient number, since it is larger than the sum of its proper divisors (15493750).

30987494 is a wasteful number, since it uses less digits than its factorization.

30987494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15493749.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 30987494 is about 5566.6411775864. The cubic root of 30987494 is about 314.0958164321.

The spelling of 30987494 in words is "thirty million, nine hundred eighty-seven thousand, four hundred ninety-four".