40099599 has 24 divisors (see below), whose sum is σ = 59701824. Its totient is φ = 25920000.

The previous prime is 40099597. The next prime is 40099621. The reversal of 40099599 is 99599004.

It is a happy number.

It is not a de Polignac number, because 40099599 - 2¹ = 40099597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40099597) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99799 + ... + 100199.

It is an arithmetic number, because the mean of its divisors is an integer number (2487576).

Almost surely, 2^40099599 is an apocalyptic number.

40099599 is a deficient number, since it is larger than the sum of its proper divisors (19602225).

40099599 is a wasteful number, since it uses less digits than its factorization.

40099599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719 (or 716 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The square root of 40099599 is about 6332.4244172355. The cubic root of 40099599 is about 342.2788072221.

It can be divided in two parts, 400995 and 99, that multiplied together give a triangular number (39698505 = T₈₉₁₀).

The spelling of 40099599 in words is "forty million, ninety-nine thousand, five hundred ninety-nine".