40542399 has 48 divisors (see below), whose sum is σ = 66515904. Its totient is φ = 23654400.

The previous prime is 40542379. The next prime is 40542401. The reversal of 40542399 is 99324504.

It is not a de Polignac number, because 40542399 - 2⁵ = 40542367 is a prime.

It is a super-2 number, since 2×40542399² = 3287372233350402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40542379) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 144139 + ... + 144419.

It is an arithmetic number, because the mean of its divisors is an integer number (1385748).

Almost surely, 2^40542399 is an apocalyptic number.

40542399 is a deficient number, since it is larger than the sum of its proper divisors (25973505).

40542399 is a wasteful number, since it uses less digits than its factorization.

40542399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368 (or 365 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 40542399 is about 6367.2913393373. The cubic root of 40542399 is about 343.5340698331.

The spelling of 40542399 in words is "forty million, five hundred forty-two thousand, three hundred ninety-nine".