40251394 has 4 divisors (see below), whose sum is σ = 60377094. Its totient is φ = 20125696.

The previous prime is 40251377. The next prime is 40251401. The reversal of 40251394 is 49315204.

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

It can be written as a sum of positive squares in only one way, i.e., 30107169 + 10144225 = 5487^2 + 3185^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10062847 + ... + 10062850.

Almost surely, 2^40251394 is an apocalyptic number.

40251394 is a deficient number, since it is larger than the sum of its proper divisors (20125700).

40251394 is a wasteful number, since it uses less digits than its factorization.

40251394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20125699.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 40251394 is about 6344.3986318642. The cubic root of 40251394 is about 342.7101564223.

Adding to 40251394 its reverse (49315204), we get a palindrome (89566598).

The spelling of 40251394 in words is "forty million, two hundred fifty-one thousand, three hundred ninety-four".