40399406 has 4 divisors (see below), whose sum is σ = 60599112. Its totient is φ = 20199702.

The previous prime is 40399399. The next prime is 40399427. The reversal of 40399406 is 60499304.

It is a happy number.

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

It is a super-2 number, since 2×40399406² = 3264224010305672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10099850 + ... + 10099853.

It is an arithmetic number, because the mean of its divisors is an integer number (15149778).

Almost surely, 2^40399406 is an apocalyptic number.

40399406 is a deficient number, since it is larger than the sum of its proper divisors (20199706).

40399406 is a wasteful number, since it uses less digits than its factorization.

40399406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20199705.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 40399406 is about 6356.0527058859. The cubic root of 40399406 is about 343.1297126325.

The spelling of 40399406 in words is "forty million, three hundred ninety-nine thousand, four hundred six".