40431554 has 4 divisors (see below), whose sum is σ = 60647334. Its totient is φ = 20215776.

The previous prime is 40431529. The next prime is 40431557. The reversal of 40431554 is 45513404.

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., 38105929 + 2325625 = 6173^2 + 1525^2 .

It is a super-4 number, since 4×40431554⁴ (a number of 32 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (40431557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10107887 + ... + 10107890.

Almost surely, 2^40431554 is an apocalyptic number.

40431554 is a deficient number, since it is larger than the sum of its proper divisors (20215780).

40431554 is a wasteful number, since it uses less digits than its factorization.

40431554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20215779.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 40431554 is about 6358.5811310386. The cubic root of 40431554 is about 343.2207041463.

Adding to 40431554 its reverse (45513404), we get a palindrome (85944958).

The spelling of 40431554 in words is "forty million, four hundred thirty-one thousand, five hundred fifty-four".