40279957 has 4 divisors (see below), whose sum is σ = 40300416. Its totient is φ = 40259500.

The previous prime is 40279951. The next prime is 40279963. The reversal of 40279957 is 75997204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (40279951) and next prime (40279963).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40279957 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 (40279951) 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, 6919 + ... + 11332.

It is an arithmetic number, because the mean of its divisors is an integer number (10075104).

Almost surely, 2^40279957 is an apocalyptic number.

It is an amenable number.

40279957 is a deficient number, since it is larger than the sum of its proper divisors (20459).

40279957 is a wasteful number, since it uses less digits than its factorization.

40279957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20458.

The product of its (nonzero) digits is 158760, while the sum is 43.

The square root of 40279957 is about 6346.6492734356. The cubic root of 40279957 is about 342.7912013643.

The spelling of 40279957 in words is "forty million, two hundred seventy-nine thousand, nine hundred fifty-seven".