87402949 has 2 divisors, whose sum is σ = 87402950. Its totient is φ = 87402948.

The previous prime is 87402947. The next prime is 87403003. The reversal of 87402949 is 94920478.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74080449 + 13322500 = 8607^2 + 3650^2 .

It is a cyclic number.

It is not a de Polignac number, because 87402949 - 2¹ = 87402947 is a prime.

Together with 87402947, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87402941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43701474 + 43701475.

It is an arithmetic number, because the mean of its divisors is an integer number (43701475).

Almost surely, 2^87402949 is an apocalyptic number.

It is an amenable number.

87402949 is a deficient number, since it is larger than the sum of its proper divisors (1).

87402949 is an equidigital number, since it uses as much as digits as its factorization.

87402949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 87402949 is about 9348.9544335182. The cubic root of 87402949 is about 443.7878030613.

The spelling of 87402949 in words is "eighty-seven million, four hundred two thousand, nine hundred forty-nine".