399701242 has 4 divisors (see below), whose sum is σ = 599551866. Its totient is φ = 199850620.

The previous prime is 399701221. The next prime is 399701257. The reversal of 399701242 is 242107993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 242107993 = 41 ⋅5905073.

It can be written as a sum of positive squares in only one way, i.e., 311134321 + 88566921 = 17639^2 + 9411^2 .

It is a super-2 number, since 2×399701242² = 319522165712685128, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99925309 + ... + 99925312.

Almost surely, 2^399701242 is an apocalyptic number.

399701242 is a deficient number, since it is larger than the sum of its proper divisors (199850624).

399701242 is a wasteful number, since it uses less digits than its factorization.

399701242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199850623.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 399701242 is about 19992.5296548486. The cubic root of 399701242 is about 736.6228150588.

The spelling of 399701242 in words is "three hundred ninety-nine million, seven hundred one thousand, two hundred forty-two".