40102399 has 4 divisors (see below), whose sum is σ = 40205880. Its totient is φ = 39998920.

The previous prime is 40102393. The next prime is 40102411. The reversal of 40102399 is 99320104.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 40102399 - 2¹¹ = 40100351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40102393) 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, 51157 + ... + 51934.

It is an arithmetic number, because the mean of its divisors is an integer number (10051470).

Almost surely, 2^40102399 is an apocalyptic number.

40102399 is a deficient number, since it is larger than the sum of its proper divisors (103481).

40102399 is a wasteful number, since it uses less digits than its factorization.

40102399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103480.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 40102399 is about 6332.6454977363. The cubic root of 40102399 is about 342.2867737054.

The spelling of 40102399 in words is "forty million, one hundred two thousand, three hundred ninety-nine".