87401999 has 4 divisors (see below), whose sum is σ = 89261664. Its totient is φ = 85542336.

The previous prime is 87401983. The next prime is 87402011. The reversal of 87401999 is 99910478.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99910478 = 2 ⋅49955239.

It is a cyclic number.

It is not a de Polignac number, because 87401999 - 2⁴ = 87401983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 1859617 = 87401999 / (8 + 7 + 4 + 0 + 1 + 9 + 9 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87401939) 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, 929762 + ... + 929855.

It is an arithmetic number, because the mean of its divisors is an integer number (22315416).

Almost surely, 2^87401999 is an apocalyptic number.

87401999 is a deficient number, since it is larger than the sum of its proper divisors (1859665).

87401999 is a wasteful number, since it uses less digits than its factorization.

87401999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1859664.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 87401999 is about 9348.9036255595. The cubic root of 87401999 is about 443.7861951829.

The spelling of 87401999 in words is "eighty-seven million, four hundred one thousand, nine hundred ninety-nine".